0000950170-22-002541 | 10-K | XBRL Viewer

General and administrative expenses

165.6

156.9

142.5

22.7

21.1

52.4

Total costs and expenses

476.6

515.4

471.7

Income from operations

727.2

576.5

376.6

Income from equity investments

10.6

10.3

3.4

Interest expense, net

105.4

94.7

62.4

Gain on sale of property, plant and equipment

0.1

Income before income tax expense

632.4

492.2

317.6

Income tax expense

14.6

7.3

(0.1)

Net income

617.8

484.9

317.7

Less: Net income attributable to noncontrolling interest

(55.0)

Less: Net income attributable to noncontrolling interest

571.4

460.9

302.6

Net income attributable to Hess Midstream LP

46.4

24.0

70.1

Less: General partners' interest in net income prior to the Restructuring

3.4

Limited partners' interest in net income

$ 46.4

$ 24.0

$ 66.7

Common Units

Weighted average limited partner units outstanding prior to the Restructuring, Basic:

Units outstanding prior to the Restructuring, Basic

27.3

Weighted average limited partner units outstanding prior to the Restructuring, Diluted:

Units outstanding prior to the Restructuring, Diluted

27.5

Subordinated Units

Weighted average limited partner units outstanding prior to the Restructuring, Basic:

Units outstanding prior to the Restructuring, Basic

27.3

Weighted average limited partner units outstanding prior to the Restructuring, Diluted:

Units outstanding prior to the Restructuring, Diluted

27.3

Class A Shares

Net income attributable to Hess Midstream LP per Class A share:

Net income attributable to Hess Midstream LP per Class A share, Basic

^[1]

$ 1.81

$ 1.33

$ 1.21

Net income attributable to Hess Midstream LP per Class A share, Diluted

^[1]

$ 1.76

$ 1.31

$ 1.20

Weighted average Class A shares outstanding

Weighted average Class A shares outstanding, Basic

25.6

18.0

Weighted average Class A shares outstanding, Diluted

25.7

18.1

18.0

[1]

*Net income attributable to Hess Midstream LP per Class A Share/limited partner unit for 2019 was calculated by combining net income per limited partner unit (common and subordinated) for the period prior to the Restructuring on December 16, 2019, and net income per Class A Share for the period subsequent to the Restructuring.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 617.8	$ 484.9	$ 317.7
Effect of hedge (gains) losses reclassified to income		(0.4)	(0.8)
Total other comprehensive income		(0.4)	(0.8)
Comprehensive income	617.8	484.5	316.9
Less: Comprehensive income (loss) attributable to net parent investment			(55.6)
Less: Comprehensive income (loss) attributable to noncontrolling interest	571.4	460.5	302.6
Comprehensive income attributable to Hess Midstream LP	$ 46.4	$ 24.0	$ 69.9

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Related Party Transactions

CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Prior To Restructuring	After Restructuring	Limited Partner Class A Shares	Limited Partner Common Unitholders Public	Limited Partner Common Unitholders Affiliate	Limited Partner Subordinated Unitholders Affiliate	Limited Partner Prior To Restructuring Common Unitholders Public	Limited Partner Prior To Restructuring Common Unitholders Affiliate	Limited Partner Prior To Restructuring Subordinated Unitholders Affiliate	Limited Partner After Restructuring Class A Shares	General Partner	General Partner Prior To Restructuring	Noncontrolling Interest	Noncontrolling Interest Prior To Restructuring	Noncontrolling Interest After Restructuring	Accumulated Other Comprehensive Income	Net Parent Investment	Net Parent Investment Prior To Restructuring
Balance, beginning of period at Dec. 31, 2018	$ 1,876.1				$ 357.1	$ 39.5	$ 105.3					$ 14.9		$ 2,194.1			$ 1.2	$ (836.0)
Net income	317.7	$ 325.0						$ 20.8	$ 12.9	$ 33.5			$ 3.4		$ 309.4				$ (55.0)
Equity-based compensation		1.3	$ 0.2					1.3			$ 0.2
Distributions to unitholders		$ (85.4)						$ (26.8)	$ (16.0)	$ (42.6)
Distributions to general partner													$ 3.8						(3.8)
Distributions to noncontrolling interest															200.6				(200.6)
Contributions from noncontrolling interest															$ 76.3				$ (76.3)
Acquisition of Hess Water Services	(225.0)																	(225.0)
Equity exchange related to Restructuring				$ 81.4	$ (352.4)	$ (36.4)	$ (96.2)					$ (14.5)		(569.8)				$ 987.9
Cash consideration related to Restructuring	(601.8)													(601.8)
Recognition of Deferred Tax Asset	49.8			50.0										(0.2)
Other comprehensive income (loss)	(0.8)		$ (7.3)								$ (0.5)					$ (6.8)	(0.8)
Balance, end of period at Dec. 31, 2019	1,332.1			131.1										1,200.6			0.4
Net income	484.9			24.0										460.9
Equity-based compensation	1.5			1.5
Distributions to unitholders	(493.7)			(31.6)										(462.1)
Acquisition of Hess Water Services	1.6													1.6
Other comprehensive income (loss)	(0.4)																$ (0.4)
Balance, end of period at Dec. 31, 2020	1,326.0			125.0										1,201.0
Net income	617.8			46.4										571.4
Equity-based compensation	1.4			1.4
Distributions to unitholders	(529.0)			(49.4)										(479.6)
Recognition of Deferred Tax Asset	89.0			89.0
Sale of shares held by Sponsors				52.4										(52.4)
Class B unit repurchase	(750.0)			(60.4)										(689.6)
Transaction costs	(2.1)			(0.3)										(1.8)
Balance, end of period at Dec. 31, 2021	$ 753.1			$ 204.1										$ 549.0

CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (Parenthetical)	12 Months Ended
	Dec. 31, 2019 $ / shares
Prior To Restructuring
Distributions to unitholders - per unit/share	$ 1.5616

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 617.8	$ 484.9	$ 317.7
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense	165.6	156.9	142.5
(Gain) loss on sale of property, plant and equipment		(0.1)
(Gain) loss on interest rate swaps		(0.4)	(0.8)
(Income) loss from equity investments	(10.6)	(10.3)	(3.4)
Distributions from equity investments	17.4	9.7
(Increase) decrease in capitalized interest			(4.1)
Amortization of deferred financing costs	7.3	6.5	5.1
Equity-based compensation expense	1.4	1.5	1.5
Deferred income tax expense (benefit)	14.6	7.3	(0.1)
Changes in assets and liabilities:
Accounts receivable – affiliate	(27.0)	(5.0)	(19.5)
Other current and noncurrent assets	(5.1)	(0.7)	(1.4)
Accounts payable – trade	(3.1)	(0.6)	11.5
Accounts payable – affiliate	9.7	0.1	3.7
Accrued liabilities	9.2	(11.4)	18.6
Other current and noncurrent liabilities	(1.7)	3.3	(0.6)
Net cash provided by (used in) operating activities	795.5	641.7	470.7
Cash flows from investing activities
Additions to property, plant and equipment	(163.2)	(301.1)	(306.4)
Acquisitions			(89.2)
Payments for equity investments			(33.0)
Proceeds from sale of property, plant and equipment		0.1
Net cash provided by (used in) investing activities	(163.2)	(301.0)	(497.5)
Cash flows from financing activities
Net proceeds from (repayments of) bank borrowings with maturities of 90 days or less	(80.0)	152.0	32.0
Bank borrowings with maturities of greater than 90 days
Borrowings			210.0
Repayments	(10.0)		(7.5)
Proceeds from issuance of senior notes	750.0		550.0
Financing costs	(11.6)	(1.3)	(20.4)
Transaction costs	(2.1)
Class B unit repurchase	(750.0)
Distributions to shareholders/unitholders	(49.4)	(31.6)	(85.4)
Distributions to noncontrolling interest	(479.6)	(462.1)
Cash consideration paid related to Restructuring			(601.8)
Capital contributions (distributions) to Hess associated with acquisitions		1.6	(156.1)
Net cash provided by (used in) financing activities	(632.7)	(341.4)	(79.2)
Increase (decrease) in cash and cash equivalents	(0.4)	(0.7)	(106.0)
Cash and cash equivalents, beginning of period	2.6	3.3	109.3
Cash and cash equivalents, end of period	2.2	2.6	3.3
Supplemental disclosure of non-cash investing and financing activities:
(Increase) decrease in accrued capital expenditures and related liabilities	(19.8)	48.1	(10.7)
Recognition of deferred tax asset	89.0		49.7
Tioga System Acquisition contingent liability adjustment	$ (4.1)	$ (3.0)
Hess
Cash flows from investing activities
Acquisitions			$ (68.9)

Description of Business

12 Months Ended

Dec. 31, 2021

Description Of Business [Abstract]

Description of Business

Note 1. Description of Business

Description of Business. We are a fee-based, growth-oriented, Delaware limited partnership formed by Hess Infrastructure Partners GP LLC (“HIP GP LLC”) and our general partner in 2019 to own, operate, develop and acquire a diverse set of midstream assets and provide fee-based services to Hess and third-party customers. We are managed and controlled by Hess Midstream GP LLC, the general partner of our general partner. Our assets are primarily located in the Bakken and Three Forks shale plays in the Williston Basin area of North Dakota, which we collectively refer to as the Bakken.

Our assets and operations are organized into the following three segments: (i) gathering, (ii) processing and storage and (iii) terminaling and export (see Note 14, Segments).

Significant 2021 Activities. In 2020, we completed construction of a 150 MMcf/d natural gas processing capacity expansion at our Tioga Gas Plant (“TGP”). In the third quarter of 2021, we safely and successfully completed the planned maintenance turnaround at TGP, during which a series of plant tie-ins for the TGP expansion were also completed. The expansion was placed in service in October 2021. Total processing capacity of 400 MMcf/d became available concurrent with the completion of a third-party residue export expansion in February 2022.

2019 Restructuring. On December 16, 2019, the Company and the Partnership completed the transactions (the “Restructuring”) contemplated by the partnership restructuring agreement, dated October 3, 2019, by and among the Company, the Partnership and the other parties thereto. As a result of the Restructuring, the Company was delegated control of the Partnership and replaced the Partnership as its publicly traded successor.

Prior to the Restructuring, the Company and the Partnership were indirectly controlled by HIP GP LLC, the general partner of Hess Infrastructure Partners LP (“HIP”). HIP was originally formed in 2015 as a joint venture between Hess and GIP II Blue Holding, L.P. (formerly GIP II Blue Holding Partnership, L.P., or “GIP” and, together with Hess, the “Sponsors”).

Prior to the Restructuring:

•

HIP owned an 80% noncontrolling economic interest in each of (i) Hess North Dakota Pipelines Operations LP (“Gathering Opco”), which owns crude oil and natural gas gathering pipelines and compressor stations in North Dakota; (ii) Hess TGP Operations LP (“HTGP Opco”), which owns the Tioga Gas Plant, a natural gas processing and fractionation plant, including a residue gas pipeline in North Dakota; and (iii) Hess North Dakota Export Logistics Operations LP (“Logistics Opco”), which owns a crude oil and natural gas liquids (“NGL”) rail loading facility, crude oil rail cars and crude oil pipeline and truck receipt terminal in North Dakota (the “Joint Interest Assets”), a 100% interest in a produced water gathering and disposal business owned by Hess Water Services Holdings LLC (“Hess Water Services”) and a 100% interest in Hess Midstream Partners GP LP (“MLP GP LP”), which held all of the Partnership’s outstanding incentive distribution rights (the “IDRs”) and the general partner interest in the Partnership (the “GP Interest”), and controlled the Partnership;

•

the Partnership, in connection with its initial public offering (“IPO”) on April 10, 2017, owned a 20% controlling interest in the Joint Interest Assets and a 100% interest in Hess Mentor Storage Holdings LLC (“Mentor Holdings”), which owns a propane storage cavern and related rail and truck loading and unloading and storage terminal in Minnesota; and

•

the Sponsors directly owned HIP and an aggregate of 10,282,654 common units representing limited partner interests in the Partnership and 27,279,654 subordinated units representing limited partner interests in the Partnership.

Pursuant to the Restructuring, which was consummated on December 16, 2019, the Partnership acquired HIP, including HIP’s 80% interest in the Joint Interest Assets, 100% interest in Hess Water Services and the outstanding economic general partner interest and IDRs. The Partnership’s organizational structure converted from a master limited partnership into an “Up-C” structure in which the Partnership’s public unitholders received newly issued Class A shares (“Class A Shares”) representing limited partner interest in Hess Midstream LP in a one-for-one exchange. The Partnership changed its name to “Hess Midstream Operations LP” and became a consolidated subsidiary of the Company.

After giving effect to the Restructuring and the 2021 equity transactions described in Note 3:

•

the Partnership owns 100% of the Joint Interest Assets, Hess Water Services and MLP GP LP, which continues to hold all of the IDRs and the GP Interest;

•

the Sponsors (i) directly hold all of the Class B units (“Class B Units”) representing limited partner interests in the Partnership, (ii) indirectly own 100% of the ownership interests in our general partner, which holds 898,000 Class A Shares (economic and voting) and all of the Class B shares (non-economic, voting only) representing limited partner interests in the Company (“Class B Shares”) and (iii) received $601.8 million in cash;

•

Class B Units of the Partnership together with the same number of Class B Shares of the Company are convertible to Class A Shares of the Company on a one-for-one basis;

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the Class A Shares commenced trading on the New York Stock Exchange under the symbol “HESM” on December 17, 2019;

•

at December 31, 2021, the Company held a 13.3% controlling interest in the Partnership and the Sponsors held a 86.7% noncontrolling economic interest in the Partnership (2020: the Company held a 6.3% controlling interest in the Partnership and the Sponsors held a 93.7% noncontrolling economic interest in the Partnership);

•

at December 31, 2021, public limited partners held a 12.9% voting interest and a 97.3% economic interest in the Company, which represents an indirect 12.9% economic interest in the Partnership (2020: public limited partners held a 6.0% voting interest and a 95.0% economic interest in the Company, which represented an indirect 6.0% economic interest in the Partnership);

•

at December 31, 2021, the Sponsors and their respective affiliates held an 87.1% voting interest and a 2.7% economic interest in the Company, which, taken with their direct limited partnership interest in the Partnership, represents an indirect 87.1% economic interest in the Partnership (2020: the Sponsors and their respective affiliates held a 94.0% voting interest and a 5.0% economic interest in the Company, which represented an indirect 94.0% economic interest in the Partnership); and

•

the Sponsors own 100% interest in the general partner of the Company and, through their ownership of the general partner, continue to have the right to elect the entire board of directors.

The acquisition of HIP by the Partnership, including its 80% economic interest in the Joint Interest Assets and 100% interest in Hess Water Services, was accounted for as an acquisition of a business under common control. Accordingly, our consolidated financial statements for the year ended December 31, 2019 are presented as if the acquisition occurred at the beginning of the year. See Note 4, Acquisitions.

LM4 Joint Venture. On January 25, 2018, we entered into a 50/50 joint venture with Targa Resources Corp. (“Targa”) to construct a new 200 MMcf/d gas processing plant called Little Missouri 4 (“LM4”). LM4 was placed in service in the third quarter of 2019. Targa is the operator of the plant. See Note 5, Related Party Transactions.

Summary of Significant Accounting Policies and Basis of Presentation	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Basis of Presentation	Note 2. Summary of Significant Accounting Policies and Basis of Presentation Consolidation. The consolidated financial statements include our accounts and the accounts of entities over which we have a controlling financial interest through our ownership or the majority voting interests of the entity. We consolidate the activities of the Partnership, and prior to the Restructuring the activities of Gathering Opco, HTGP Opco and Logistics Opco, each as a variable interest entity (“VIE”) under U.S. Generally Accepted Accounting Principles (“GAAP”). We have concluded that we are the primary beneficiary of the VIE, as defined in the accounting standards, since we have the power, through our ownership, to direct those activities that most significantly impact the economic performance of the Partnership. This conclusion was based on a qualitative analysis that considered the Partnership’s governance structure and the delegation of control provisions, which provide us the ability to control the operations of the Partnership. All financial statement activities associated with the VIE are captured within gathering, processing and storage, and terminaling and export segments (see Note 14, Segments). At December 31, 2021, our noncontrolling interest represents the 86.7% interest in the Partnership retained by Hess and GIP (2020: 93.7%). Prior to the Restructuring, our noncontrolling interest represented the 80% interest in the Joint Interest Assets retained by HIP. All intercompany transactions and balances have been eliminated. Use of Estimates. We prepare our consolidated financial statements in conformity with the U.S. GAAP, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the years presented. Changes in facts and circumstances may result in revised estimates and actual results could differ from those estimates. Common Control Transactions. Assets and businesses acquired from Hess and its subsidiaries are accounted for as common control transactions whereby the net assets acquired are combined with net assets of the Company at Hess’ historical carrying value. If any recognized consideration transferred in such a transaction exceeds the carrying value of the net assets acquired, the excess is treated as a capital distribution to Hess, similar to a dividend. To the extent that such transactions require prior periods to be retrospectively adjusted, historical net equity amounts prior to the transaction date are reflected in “Net Parent Investment.” Cash consideration up to the carrying value of net assets acquired is presented as an investing activity in our consolidated statement of cash flows. Cash consideration in excess of the carrying value of net assets acquired is presented as a financing activity in our consolidated statement of cash flows. Cash and Cash Equivalents. Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have maturities of three months or less when acquired. Accounts Receivable. We record affiliate accounts receivable upon performance of services to affiliated companies. Generally, we receive payments from affiliated companies on a monthly basis, shortly after performance of services. There were no doubtful accounts written off, nor have we provided an allowance for doubtful accounts, as of December 31, 2021 and 2020. Property, Plant and Equipment. Property, plant and equipment are stated at the lower of historical cost less accumulated depreciation subject to the results of impairment testing. We capitalize all construction-related direct labor and material costs, as well as indirect construction costs. Indirect construction costs include general engineering, taxes and the cost of funds used during construction. Costs, including complete asset replacements and enhancements or upgrades that increase the original efficiency, productivity or capacity of property, plant and equipment, are also capitalized. The costs of repairs, minor replacements and other projects, which do not increase the original efficiency, productivity or capacity of property, plant and equipment, are expensed as incurred. Capitalization of Interest. Interest charges from borrowings are capitalized on material projects using the weighted average cost of outstanding borrowings until the project is substantially complete and ready for its intended use. Capitalized interest is depreciated over the useful lives of the assets in the same manner as the depreciation of the underlying assets. Impairment of Long‑Lived Assets. We review long-lived assets for impairment whenever events or changes in business circumstances indicate the net book values of the assets may not be recoverable. Factors that indicate potential impairment include a significant decrease in the market value of the asset, operating or cash flow losses associated with the use of the asset, and a significant change in the asset’s physical condition or use. Impairment is indicated when the undiscounted cash flows estimated to be generated by those assets are less than the assets’ net book value. Undiscounted cash flows are based on identifiable cash flows that are largely independent of the cash flows of other assets and liabilities. If impairment occurs, a loss is recognized for the difference between the fair value and net book value. Such fair value is generally determined by discounting anticipated future net cash flows, an income valuation approach, or by a market-based valuation approach, which are Level 3 fair value measurements. No impairments of long‑lived assets were recorded during the years ended December 31, 2021, 2020 and 2019. Leases. We determine if an arrangement is a lease at inception. Operating lease right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The operating lease right-of-use asset includes any initial direct costs and excludes lease incentives received. The lease term used in measurement of our lease obligations may include periods covered by an option to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has elected not to recognize lease assets and lease liabilities for leases with a term of 12 months or less for all classes of underlying assets. Our lease agreements may include lease and non-lease components, which are generally accounted for separately. Equity Investments. We account for our investment in LM4 under the equity method of accounting, as we do not control, but have a significant influence over, its operations. During the year ended December 31, 2019, we capitalized $4.1 million of interest expense associated with our investment in LM4. Difference in the basis of the investment and the underlying net asset value of the equity investee is amortized into net income over the remaining useful lives of the underlying assets. Earnings from equity investments represent our proportionate share of net income generated by the equity investee. We classify distributions received from equity method investees on the basis of the nature of the activity of the investee that generated the distribution as either a return on investment classified as cash inflows from operating activities or a return of investment classified as cash inflows from investing activities when such information is available to us. Deferred Financing Costs. We capitalize debt issuance costs and fees incurred related to the procurement of our credit facilities. We amortize such costs as additional interest expense over the life of the credit agreement using the straight-line method, which approximates the effective interest method. Unamortized deferred financing costs related to our revolving credit facility are presented in Other noncurrent assets (2021: $6.9 million, 2020: $9.3 million) and unamortized deferred financing costs and discounts related to our fixed-rate senior notes and our term loan are presented as a direct reduction to the Long-term debt (2021: $30.5 million, 2020: $23.9 million) in the accompanying consolidated balance sheets. Asset Retirement Obligations. We record legal obligations to remove and dismantle long-lived assets. We recognize a liability for the fair value of legally required asset retirement obligations associated with long-lived assets in the period in which the retirement obligations are incurred if the liability can be reasonably estimated. The associated asset retirement costs are capitalized as part of the carrying amount of the long-lived assets. Accretion expense is included in Depreciation expense in the consolidated statement of operations. At December 31, 2021, the asset retirement obligation balance included in Other noncurrent liabilities was $11.0 million and the current portion included in Accrued liabilities was $3.0 million (2020: $12.8 million and $1.7 million, respectively). Net Parent Investment. Net parent investment represents HIP’s historical activity as well as Hess’ historical investment in Hess Water Services prior to its acquisition by HIP, the accumulated net operating results through the date when we obtained control of HIP, and the net effect of transactions between HIP and the Sponsors, and between Hess and Hess Water Services. Retrospectively adjusted financial information from prior to the acquisition of HIP is included in Net parent investment. Revenue Recognition—Contracts with Customers. We earn substantially all of our revenues by charging fees for gathering, compressing and processing natural gas and fractionating NGLs; gathering, terminaling, loading and transporting crude oil and NGLs, gathering and disposing produced water, and storing and terminaling propane. We do not own or take title to the volumes that we handle. Effective January 1, 2014, we entered into (i) gas gathering, (ii) crude oil gathering, (iii) gas processing and fractionation, (iv) storage services and (v) terminal and export services fee‑based commercial agreements with certain subsidiaries of Hess, and effective January 1, 2019, we entered into water gathering and disposal services fee-based agreements with a subsidiary of Hess. Our responsibilities to provide each of the above services for each year under each of the commercial agreements are considered separate, distinct performance obligations. We recognize revenues for each performance obligation under our commercial agreements over‑time as services are rendered using the output method, measured using the amount of volumes serviced during the period. The minimum volume commitments are subject to fluctuation based on nominations covering substantially all of Hess’ production and projected third-party volumes that will be purchased in the Bakken. As the minimum volume commitments are subject to fluctuation, and these commercial agreements contain fee inflation escalators and fee recalculation mechanisms, substantially all of the transaction price, as this term is defined in Accounting Standards Codification (“ASC”) Topic, ASC 606, is variable at inception of each of the commercial agreements. As the variability is resolved prior to the recognition of revenue, we do not apply a constraint to the transaction price at the inception of the commercial agreements. We elected the practical expedient to recognize revenue in the amount to which we have a right to invoice as permitted under ASC 606. Due to this election and as the transaction price allocated to our unsatisfied performance obligations is entirely variable, we have elected the exemption provided by ASC 606 from the disclosure of revenue recognizable in future periods as our unsatisfied performance obligations are fulfilled. There are no significant financing components in any of our commercial agreements. The minimum volumes that Hess provides to our assets under our commercial agreements include dedicated production covering substantially all of Hess’ existing and future owned or controlled production in the Bakken and projected third-party volumes owned or controlled by Hess through dedicated third-party contracts. If Hess delivers volumes less than the applicable minimum volume commitments under our commercial agreements during any quarter, Hess is obligated to pay us a shortfall fee equal to the volume deficiency multiplied by the related gathering, processing and/or terminaling fee, as applicable. Our responsibility to stand-ready to service a minimum volume over each quarterly commitment period represents a separate, distinct performance obligation. Currently, and for the remainder of the Initial Term of each commercial agreement as described in Note 5, volume deficiencies are measured quarterly and recognized as revenue in the same period, as any associated shortfall payments are not subject to future reduction or offset. During the Secondary Term of each commercial agreement as described in Note 5, Hess will be entitled to receive a credit, calculated in barrels or Mcf, as applicable, with respect to the amount of any shortfall fee paid by Hess, which will initially be reported in deferred revenue. Hess may apply such credit against the fees payable for any volumes delivered to us under the applicable agreement in excess of Hess’ nominated volumes up to four quarters after such credit is earned. Unused credits by Hess will be recognized as revenue when they expire after four quarters. However, Hess will not be entitled to receive any such credit with respect to crude oil terminaling services under our terminal and export services agreement. Our revenues also include pass‑through third‑party rail transportation costs, third-party produced water trucking and disposal costs, electricity fees and certain other fees for which we recognize revenues in an amount equal to the costs. Depreciation Expense. We calculate depreciation using the straight-line method based on the estimated useful lives after considering salvage values of our assets. Depreciation lives range from 12 to 35 years. However, factors such as maintenance levels, economic conditions impacting the demand for these assets, and regulatory or environmental requirements could cause us to change our estimates, thus impacting the future calculation of depreciation. Equity‑Based Compensation. Equity‑based compensation issued to the officers, directors and employees of our general partner is recorded at grant‑date fair value. Expense is recognized on a straight‑line basis over the vesting period of the award and is included in General and administrative expenses in the accompanying consolidated statements of operations. Forfeitures are recognized as they occur. Income Taxes. Deferred income taxes are determined using the liability method and reflect temporary differences between the financial statement carrying amount and income tax basis of assets and liabilities recorded using the statutory income tax rate. Regular assessments are made of the likelihood of those deferred tax assets being realized. If it is more likely than not that some or all of the deferred tax assets will not be realized, a valuation allowance is recorded to reduce the deferred tax assets to the amount expected to be realized. Prior to the Restructuring on December 16, 2019, we were not a separate taxable entity for U.S. federal and state income tax purposes; therefore, we did not provide for income tax benefit or expense. Each partner was subject to income taxes on its share of the Partnership’s earnings. On March 1, 2019, HIP acquired Hess Water Services (see Note 4, Acquisitions). For the periods prior to March 1, 2019, Hess Water Services was included in the consolidated income tax returns of Hess. The provision for Hess Water Services’ income taxes and income tax assets and liabilities were determined as if it were a standalone taxpayer for all periods presented. For the period from March 1, 2019 through the Restructuring date of December 16, 2019, Hess Water Services was not taxable itself and was not part of a separate taxable entity; therefore, no income tax provision was recognized. Net Income Per Limited Partner Unit. Prior to the Restructuring, we identified the general partner interest and IDRs as participating securities and computed income per unit using the two‑class method under which net income per unit was calculated for common units and participating securities considering both distributions declared and participation rights in undistributed earnings as if all such earnings had been distributed during that period. Net income per unit applicable to limited partners, including subordinated unitholders, was computed by dividing limited partners' interest in net income, after deducting the general partner's 2% interest and IDRs, by the weighted‑average number of outstanding common and subordinated units. Environmental and Legal Contingencies. We accrue and expense environmental costs on an undiscounted basis to remediate existing conditions related to past operations when the future costs are probable and reasonably estimable. In the ordinary course of business, the Company is from time to time party to various judicial and administrative proceedings. We regularly assess the need for accounting recognition or disclosure of these contingencies. In the case of a known contingency, we accrue a liability when the loss is probable and the amount is reasonably estimable. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. Fair Value Measurements. We measure assets and liabilities requiring fair value presentation using an exit price (i.e., the price that would be received to sell an asset or paid to transfer a liability) and disclose such amounts according to the level of valuation inputs under the following hierarchy: Level 1: Quoted prices in an active market for identical assets or liabilities. Level 2: Inputs other than quoted prices that are directly or indirectly observable. Level 3: Unobservable inputs that are significant to the fair value of assets or liabilities. The classification of an asset or liability within the fair value measurement hierarchy is based on the lowest level of input significant to its fair value. There were no nonrecurring fair value measurements during the years ended December 31, 2021 and 2020. We had other short‑term financial instruments, primarily cash and cash equivalents, accounts receivable and accounts payable, for which the carrying value approximated their fair value as of December 31, 2021 and 2020. Derivatives. We may utilize derivative instruments for financial risk management activities. In these activities, we may use futures, forwards, options and swaps, individually or in combination, to mitigate our exposure to fluctuations in interest rates. All derivative instruments are recorded at fair value in our consolidated balance sheet. Our policy for recognizing the changes in fair value of derivatives varies based on the designation of the derivative. The changes in fair value of derivatives that are not designated as hedges are recognized in earnings. Derivatives may be designated as hedges of expected future cash flows or forecasted transactions (cash flow hedges). Changes in fair value of derivatives that are designated as cash flow hedges are recorded as a component of other comprehensive income (loss). Amounts included in Accumulated other comprehensive income (loss) for cash flow hedges are reclassified into earnings in the same period that the hedged item is recognized in earnings. New Accounting Pronouncements In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2020-04, Reference Rate Reform, as a new ASC Topic, ASC 848 and also issued subsequent amendments to the initial guidance (collectively, “ASC 848”). The purpose of ASC 848 is to provide optional guidance to ease the potential effects on financial reporting of the market-wide migration away from Interbank Offered Rates, such as London Interbank Offered Rate (“LIBOR”) to alternative reference rates. ASC 848 applies only to contracts, hedging relationships, debt arrangements and other transactions that reference a benchmark reference rate expected to be discontinued because of reference rate reform. ASC 848 contains optional expedients and exceptions for applying U.S. GAAP to transactions affected by this reform. The amendments in the ASU are effective for all entities through December 31, 2022. Borrowing under our Credit Facilities bear interest at LIBOR plus an applicable margin (see Note 8, Debt and Interest Expense). Although our Credit Facilities mature in 2024, they include provisions for transition to an alternative reference rate without interruption in our ability to borrow under these Credit Facilities. We do not expect our adoption of ASC 848 or transition to an alternative reference rate will have a material impact on our consolidated financial statements.

Equity Transactions

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Equity Transactions

Note 3. Equity Transactions

Equity Offering Transactions

On March 15, 2021, Hess Investments North Dakota LLC (“HINDL”) and GIP II Blue Holding, L.P. ( “GIP” and, together with HINDL, the “Sponsors”) sold an aggregate of 6,900,000 of our Class A shares representing limited partner interests (“Class A Shares”), inclusive of the underwriters’ option to purchase up to 900,000 of additional shares, which was fully exercised, in an underwritten public offering at a price of $21.00 per Class A share, less underwriting discounts.

On October 8, 2021, the Sponsors sold an aggregate of 8,625,000 of our Class A Shares, inclusive of the underwriters’ option to purchase up to 1,125,000 of additional shares, which was fully exercised, in an underwritten public offering at a price of $26.00 per Class A share, less underwriting discounts. The Sponsors received net proceeds from the two offerings of approximately $356.5 million in total, after deducting underwriting discounts. The Company did not receive any proceeds in the offerings.

The above equity offering transactions were conducted pursuant to a registration rights agreement among us and the Sponsors. The Class A Shares sold in the offerings were obtained by the Sponsors by exchanging to us the respective number of their Class B Units in the Partnership, together with an equal number of our Class B Shares and, as a result, the total number of Class A and Class B shares did not change. The Company retained control in the Partnership based on the delegation of control provisions, as described in Note 2, Summary of Significant Accounting Policies and Basis of Presentation. As a result of the equity offering transactions, we recognized an adjustment to the carrying amount of noncontrolling interest and Class A shareholders’ capital balance of $52.4 million to reflect the change in ownership interest. We also recognized an additional deferred tax asset of $74.2 million related to the change in the temporary difference between carrying amount and tax basis of our investment in the Partnership. The effect of recognizing the additional deferred tax asset was included in Class A shareholders’ equity balance in the accompanying consolidated statement of changes in partners’ capital due to the transaction being characterized as a transaction among or with shareholders.

Class B Unit Repurchase

On July 27, 2021, the Company, the Partnership and our Sponsors entered into a unit repurchase agreement pursuant to which the Partnership purchased from each Sponsor 15,625,000 Class B Units representing limited partner interests in the Partnership for an aggregate purchase price of $750.0 million (the “Repurchase Transaction”). The purchase price per Class B Unit was $24.00, representing an approximate 4% discount to the 30-day volume weighted average trading price of Class A Shares representing limited partner interests in the Company through July 27, 2021. Pursuant to the terms of the repurchase agreement, immediately following the purchase of the Class B Units from the Sponsors, the Partnership cancelled those units, and the Company cancelled, for no consideration, an equal number of Class B Shares representing limited partner interests in the Company held by the Company’s general partner. The Repurchase Transaction closed on August 10, 2021 and was funded through issuance of new $750.0 million senior unsecured notes (see Note 8, Debt and Interest Expense).

The Repurchase Transaction was accounted for in accordance with ASC 810 whereby changes in a parent’s ownership interest while the parent retains its controlling financial interest in its subsidiary are accounted for as equity transactions. The carrying amount of the noncontrolling interest was adjusted to reflect the change in the ownership interest with the difference between the amount of consideration paid and the amount by which the noncontrolling interest was adjusted recognized in equity attributable to Class A shareholders. We incurred approximately $2.1 million of costs directly attributable to the Repurchase Transaction that were charged to equity. We also recognized an additional deferred tax asset of approximately $14.8 million related to the change in the temporary difference between carrying amount and tax basis of our investment in the Partnership, the effect of which was included in Class A shareholders’ equity balance in the accompanying consolidated statement of changes in partners’ capital.

As a result of the equity offering transactions and the Repurchase Transaction described above, the Company’s consolidated ownership in the Partnership increased from 6.3% at December 31, 2020 to 13.3% at December 31, 2021.

Acquisitions

12 Months Ended

Dec. 31, 2021

Business Combinations [Abstract]

Acquisitions

Note 4. Acquisitions

Hess Water Services Acquisition

On March 1, 2019, HIP acquired 100% of the membership interest in Hess Water Services that owns Hess’ existing Bakken water services business for $225.0 million in cash. HIP funded the purchase price through a combination of cash on hand and borrowings under its revolving credit facility. In connection with the Hess Water Services acquisition, HIP acquired the following:


(in millions)
Property, plant and equipment, net	$	70.8
Working capital		(1.2	)
Asset retirement obligations		(0.7	)
Net assets acquired	$	68.9

The transaction was accounted for as an acquisition of a business between entities under common control, and therefore, the related acquired assets and liabilities were transferred at Hess’ historical carrying value. In 2019, we recognized $156.1 million of consideration in excess of the book value of net assets acquired as a capital distribution to Hess, which is reflected within Net parent investment in the accompanying consolidated statements of changes in partners’ capital. In 2020, we received $1.6 million from Hess as part of the final settlement.

Hess Water Services is included in our gathering segment (see Note 14, Segments).

Tioga System Acquisition

On March 22, 2019, we acquired 100% of the membership interest in Tioga Midstream Partners LLC from Summit Midstream Partners, LP that owns oil, gas, and water gathering assets (the “Tioga System Acquisition”). The transaction was accounted for as an asset acquisition. The Tioga System, located in Williams County in western North Dakota, is complementary to our infrastructure, and is currently delivering volumes into our gathering system.

We paid $89.2 million in cash at closing, net of cash acquired, and recognized a contingent liability for additional potential payments in future periods subject to certain performance metrics. The contingent liability is included in Other noncurrent liabilities on our accompanying consolidated balance sheet (2021: $2.9 million, 2020: $7.0 million). The contingent liability was partially reduced in 2021 due to no planned drilling in the dedicated acreage. We funded the purchase price through a combination of cash on hand and borrowings under our revolving credit facility.

The acquired Tioga System is included in our gathering segment (see Note 14, Segments).

Hess Infrastructure Partners LP Acquisition

On December 16, 2019, the Company and the Partnership completed the Restructuring, pursuant to which the Partnership acquired all of the partnership interests in HIP from the Sponsors, including HIP’s retained 80% economic interest in the Joint Interest Assets, 100% interest in Hess Water Services and the outstanding economic general partner and incentive distribution rights in the Partnership. The Partnership’s organizational structure converted from a master limited partnership into an “Up-C” structure in which the Partnership’s public unitholders received newly issued Class A Shares in Hess Midstream LP in a one-for-one exchange. The Partnership changed its name to “Hess Midstream Operations LP” and became a consolidated subsidiary of the Company. As a consideration for the Restructuring, the Sponsors received 898,000 Class A Shares in the Company, 266,416,928 Class B Units representing noncontrolling limited partner interests in the Partnership and cash consideration of $601.8 million. Class B Units of the Partnership together with the same number of Class B Shares of the Company are convertible to Class A Shares of the Company on a one-for-one basis (see Note 9, Partners’ Capital and Distributions).

Our 2019 consolidated statement of operations includes $26.2 million of costs associated with the Restructuring reflected in general and administrative expenses.

Related Party Transactions

12 Months Ended

Dec. 31, 2021

Note 5. Related Party Transactions

We are part of the consolidated operations of Hess, and substantially all of our revenues as shown on the accompanying consolidated statements of operations for the years ended December 31, 2021, 2020 and 2019 were derived from transactions with Hess and its affiliates, although we plan to provide our services to third parties in the future. Hess also provides substantial operational and administrative services to us in support of our assets and operations.

Commercial Agreements

Effective January 1, 2014, we entered into i) gas gathering, ii) crude oil gathering, iii) gas processing and fractionation, iv) storage services, and v) terminal and export services fee‑based commercial agreements with certain subsidiaries of Hess. Effective January 1, 2019, in connection with the Hess Water Services Acquisition, we entered into long-term fee-based water services agreements with a subsidiary of Hess. For the services performed under these commercial agreements, we receive a fee per barrel of crude oil, barrel of water, Mcf of natural gas, or Mcf equivalent of NGLs, as applicable, delivered during each month, and Hess is obligated to provide us with minimum volumes of crude oil, water, natural gas and NGLs. MVCs are equal to 80% of Hess' nominations in each development plan that apply on a three-year rolling basis such that MVCs are set for the three years following the most recent nomination. Without our consent, the MVCs resulting from the nominated volumes for any quarter or year contained in any prior development plan cannot be reduced by any updated development plan unless dedicated production is released by us. The applicable MVCs may, however, be increased as a result of the nominations contained in any such updated development plan.

Except for the water services agreements and except for a certain gathering sub-system as described below, each of our commercial agreements with Hess has an initial 10-year term effective January 1, 2014 (“Initial Term”). For this gathering sub-system, the Initial Term is 15 years effective January 1, 2014 and for the water services agreements the Initial Term is 14 years effective January 1, 2019. Each of our commercial agreements other than our storage services agreement includes an inflation escalator and a fee recalculation mechanism that allows fees to be adjusted annually during the Initial Term for updated estimates of cumulative throughput volumes and our capital and operating expenditures in order to target a return on capital deployed over the Initial Term of the applicable commercial agreement (or, with respect to the crude oil services fee under our terminal and export services agreement, the 20-year period commencing on the effective date of the agreement).

We have the unilateral right, exercisable by the delivery of a written notice on or before the date that is three years prior to the expiration of the Initial Term, to extend each commercial agreement for one additional 10-year term (“Secondary Term”). For a certain gathering sub-system, the Secondary Term is 5-years and for the water services agreements the Secondary Term is 10 years. On December 30, 2020, we exercised our renewal options to extend the terms of certain crude oil gathering, terminaling, storage, gas processing and gas gathering commercial agreements with Hess for the Secondary Term through December 31, 2033. There were no changes to any provisions of the existing commercial agreements as a result of the exercise of the renewal options. For the remaining water gathering and disposal agreements as well as the remaining gas gathering agreement, we have the sole option to renew these agreements for an additional term that is exercisable at a later date.

During the Secondary Term of each of our commercial agreements other than our storage services agreement and terminal and export services agreement (with respect to crude oil terminaling services), the fee recalculation model under each applicable agreement will be replaced by an inflation-based fee structure. The initial fee for the first year of the Secondary Term will be determined based on the average fees paid by Hess under the applicable agreement during the last three years of the Initial Term (with such fees adjusted for inflation through the first year of the Secondary Term). For each year following the first year of the Secondary Term, the applicable fee will be adjusted annually based on the percentage change in the consumer price index, provided that we may not increase any fee by more than 3% in any calendar year solely by reason of an increase in the consumer price index, and no fee will ever be reduced below the amount of the applicable fee payable by Hess in the prior year as a result of a decrease in the consumer price index. During the Secondary Term of our commercial agreements, Hess will continue to have MVCs equal to 80% of Hess' nominations in each development plan that apply on a three-year rolling basis through the Secondary Term.

For the years ended December 31, 2021, 2020 and 2019, approximately 100% of our revenues were attributable to our fee‑based commercial agreements with Hess, including revenues from third‑party volumes contracted with Hess and delivered to us under these agreements. Together with Hess, we are pursuing strategic relationships with third-party producers and other midstream companies with operations in the Bakken in order to maximize our utilization rates.

Revenues from contracts with customers on a disaggregated basis were as follows:


	Year Ended December 31,
	2021		2020		2019
(in millions)
Oil and gas gathering services	$	540.4	$	469.3	$	345.6
Processing and storage services		435.7		370.3		294.7
Terminaling and export services		137.5		159.4		130.0
Water gathering and disposal services		90.2		92.6		77.3
Total revenues from contracts with customers	$	1,203.8	$	1,091.6	$	847.6
Other income		-		0.3		0.7
Total revenues	$	1,203.8	$	1,091.9	$	848.3

The following table presents MVC shortfall fees earned during each period:


	Year Ended December 31,
	2021		2020		2019
(in millions)
Oil and gas gathering services	$	43.0	$	12.5	$	5.0
Terminaling and export services		32.8		4.8		2.2
Water gathering and disposal services		6.8		1.4		1.1
Processing and storage services		4.4		-		-
Total	$	87.0	$	18.7	$	8.3

The following table presents third-party pass-through costs for which we recognize revenues in an amount equal to the costs. These third-party costs are included in Operating and maintenance expenses in the accompanying consolidated statements of operations.


	Year Ended December 31,
	2021		2020		2019
(in millions)
Electricity and other related fees	$	50.3	$	40.0	$	32.2
Produced water trucking and disposal costs		37.0		55.9		57.7
Rail transportation costs		0.1		50.7		40.2
Total	$	87.4	$	146.6	$	130.1

Omnibus and Employee Secondment Agreements

We entered into an omnibus agreement with Hess under which we pay Hess on a monthly basis an amount equal to the total allocable costs of Hess’ employees and contractors, subcontractors or other outside personnel engaged by Hess and its subsidiaries to the extent such employees and outside personnel perform operational and administrative services for us in support of our assets, plus a specified percentage markup of such amount depending on the type of service provided, as well as an allocable share of direct costs of providing these services.

We also entered into an employee secondment agreement with Hess under which certain employees of Hess are seconded to our general partner to provide services with respect to our assets and operations, including executive oversight, business and corporate development, unitholder and investor relations, communications and public relations, routine and emergency maintenance and repair services, routine operational services, routine administrative services, construction services, and such other operational, commercial and business services that are necessary to develop and execute the Company’s business strategy. On a monthly basis, we pay a secondment fee to Hess that is intended to cover and reimburse Hess for the total costs actually incurred by Hess and its affiliates in connection with employing the seconded employees to the extent such total costs are attributable to the provision of services with respect to the Company’s assets and operations.

For the years ended December 31, 2021, 2020 and 2019, we had the following charges from Hess. The classification of these charges between operating and maintenance expenses and general and administrative expenses is based on the fundamental nature of the services being performed for our operations.


	Year Ended December 31,
	2021		2020		2019
(in millions)
Operating and maintenance expenses	$	63.6	$	62.8	$	53.1
General and administrative expenses		15.4		15.1		15.5
Total	$	79.0	$	77.9	$	68.6

LM4 Agreements

Separately from our commercial agreements with Hess, effective January 24, 2018, we entered into a gas processing agreement with LM4, a 50/50 joint venture with Targa, under which we deliver natural gas to LM4, and LM4 processes and redelivers certain volumes of residue gas and NGLs resulting from such processing services. The agreement has a 16-year initial term, after which it is automatically renewed for subsequent one-year terms unless terminated by either party. Under this agreement, we pay a processing fee per Mcf of natural gas and reimburse LM4 for our proportionate share of electricity costs. These processing fees are included in Operating and maintenance expenses in the accompanying consolidated statements of operations.

We are entitled to 50% of the available processing capacity of the LM4 gas processing plant. Should Targa not use all of the remaining processing capacity at the plant on any day, such unutilized portion of the available capacity will be available for our use. Regardless of the actual portion of the plant available capacity utilized by each joint venture member during a given period, under the LM4 amended and restated limited liability company agreement, profits and losses and cash distributions of the LM4 joint venture are allocated 50/50 between Targa and us. LM4 was placed in service in the third quarter of 2019.

For the years ended December 31, 2021, 2020 and 2019, we had the following activity related to our agreements with LM4:


	Year Ended December 31,
	2021		2020		2019
(in millions)
Processing fee incurred	$	27.7	$	25.6	$	6.3
Earnings from equity investments	$	10.6	$	10.3	$	3.4
Distributions received from equity investments	$	17.4	$	9.7	$	-

Property, Plant and Equipment

12 Months Ended

Dec. 31, 2021

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

Note 6. Property, Plant and Equipment

Property, plant and equipment, at cost, is as follows:


	Estimated useful lives	December 31, 2021			December 31, 2020
(in millions, except for number of years)
Gathering assets
Pipelines	22 years	$	1,489.7		$	1,470.6
Compressors, pumping stations and terminals	22 to 25 years		809.0			778.6
Gas plant assets
Pipelines, pipes and valves	22 to 25 years		460.0			460.0
Equipment	12 to 30 years		428.3			428.3
Processing and fractionation facilities	25 years		408.7			189.0
Buildings	35 years		182.3			182.3
Logistics facilities and railcars	20 to 25 years		386.5			386.2
Storage facilities	20 to 25 years		19.5			19.5
Other	20 to 25 years		25.8			20.9
Construction-in-progress	N/A		131.6			227.3
Total property, plant and equipment, at cost			4,341.4			4,162.7
Accumulated depreciation			(1,216.4	)		(1,051.4	)
Property, plant and equipment, net		$	3,125.0		$	3,111.3

Accrued Liabilities and Other Current Liabilities

12 Months Ended

Dec. 31, 2021

Accrued Liabilities Current [Abstract]

Accrued Liabilities and Other Current Liabilities

Note 7. Accrued Liabilities and Other Current Liabilities

Accrued liabilities are as follows:


	December 31, 2021		December 31, 2020
(in millions)
Accrued interest	$	30.9	$	18.0
Accrued capital expenditures		26.5		13.6
Other accruals		18.8		22.5
Total	$	76.2	$	54.1

Other current liabilities at December 31, 2021, of $10.2 million (2020: $9.9 million) represent payables for property and sales and use taxes.

Debt and Interest Expense

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Debt and Interest Expense

Note 8. Debt and Interest Expense

Total long-term debt is as follows:


	December 31, 2021			December 31, 2020
(in millions)
Fixed-rate senior notes:
5.625% due 2026	$	800.0		$	800.0
5.125% due 2028		550.0			550.0
4.250% due 2030		750.0			-
Total fixed-rate senior notes		2,100.0			1,350.0
Term Loan A facility		390.0			400.0
Revolving credit facility		104.0			184.0
Total Borrowings		2,594.0			1,934.0
Unamortized deferred financing costs and discounts		(30.5	)		(23.9	)
Total debt		2,563.5			1,910.1
Less: current maturities of long-term debt		20.0			10.0
Total long-term debt	$	2,543.5		$	1,900.1

As of December 31, 2021, the maturity profile of total debt, excluding deferred financing costs and discounts, is as follows:


(in millions)	Total		2022		2023		2024		2025		2026		2027 and thereafter
Fixed-rate senior notes	$	2,100.0	$	-	$	-	$	-	$	-	$	800.0	$	1,300.0
Term Loan facility		390.0		20.0		30.0		340.0		-		-		-
Revolving credit facility		104.0		-		-		104.0		-		-		-
Total debt (excluding interest)	$	2,594.0	$	20.0	$	30.0	$	444.0	$	-	$	800.0	$	1,300.0

Fixed‑Rate Senior Notes

In August 2021, the Partnership issued $750.0 million aggregate principal amount of 4.250% fixed‑rate senior notes due 2030 to qualified institutional investors. The notes are guaranteed by certain subsidiaries of the Partnership. Interest is payable semi‑annually on February 15 and August 15. The Partnership used the proceeds to fund the Repurchase Transaction (see Note 3, Equity Transactions).

In December 2019, the Partnership issued $550.0 million aggregate principal amount of 5.125% fixed‑rate senior notes due 2028 to qualified institutional investors. The notes are guaranteed by certain subsidiaries of the Partnership. Interest is payable semi‑annually on June 15 and December 15. The Partnership used the net proceeds to finance the acquisition of HIP, including to repay borrowings under HIP’s credit facilities, and pay related fees and expenses (see Note 4, Acquisitions).

In December 2019, in connection with the Restructuring, the Partnership, assumed $800.0 million aggregate principal amount of 5.625% outstanding fixed-rate senior notes of HIP in a par-for-par exchange for newly issued 5.625% senior notes due 2026 of the Partnership and paid approximately $2.0 million of exchange consent fees. The notes are guaranteed by certain subsidiaries of the Partnership. Interest is payable semi‑annually on February 15 and August 15.

Each of the indentures for the senior notes described above contains customary covenants that restrict our ability and the ability of our restricted subsidiaries to (i) declare or pay any dividend or make any other restricted payments; (ii) transfer or sell assets or subsidiary stock; (iii) incur additional debt; or (iv) make restricted investments, unless, at the time of and immediately after giving pro forma effect to such restricted payments and any related incurrence of indebtedness or other transactions, no default has occurred and is continuing or would occur as a consequence of such restricted payment and if the leverage ratio does not exceed 4.25 to 1.00. As of December 31, 2021, we were in compliance with all debt covenants under the indentures.

In addition, the covenants included in the indentures governing the senior notes contain provisions that allow the Company to satisfy the Partnership’s reporting obligations under the indentures, as long as any such financial information of the Company contains information reasonably sufficient to identify the material differences, if any, between the financial information of the Company, on the one hand, and the Partnership and its subsidiaries on a stand-alone basis, on the other hand and the Company does not directly own capital stock of any person other than the Partnership and its subsidiaries, or material business operations that would not be consolidated with the financial results of the Partnership and its subsidiaries. The Company is a holding company and has no independent assets or operations. Other than the interest in the Partnership and the effect of federal and state income taxes that are recognized at the Company level, there are no material differences between the consolidated financial statements of the Partnership and the consolidated financial statements of the Company.

Credit Facilities

In December 2019, in connection with the Restructuring, both HIP and the Partnership retired their existing senior secured revolving credit facilities, HIP retired its senior secured Term Loan A facility and the Partnership entered into new senior secured credit facilities (the “Credit Facilities”) consisting of a $1,000.0 million 5-year revolving credit facility and a fully drawn $400.0 million 5-year Term Loan A facility, receiving cash of $210.0 million at closing. Facility fees accrue on the total capacity of the revolving credit facility. Borrowings under the 5-year Term Loan A facility generally bear interest at LIBOR plus the applicable margin ranging from 1.55% to 2.50%, while the applicable margin for the 5-year syndicated revolving credit facility ranges from 1.275% to 2.000%. Pricing levels for the facility fee and interest-rate margins are based on the Partnership’s ratio of total debt to EBITDA (as defined in the Credit Facilities). If the Partnership obtains an investment grade credit rating, the pricing levels will be based on the Partnership’s credit ratings in effect from time to time. At December 31, 2021, borrowings of $104.0 million were drawn and outstanding under the Partnership’s revolving credit facility, and borrowings of $390.0 million, excluding deferred issuance costs, were drawn and outstanding under the Partnership’s Term Loan A facility.

The Credit Facilities can be used for borrowings and letters of credit for general corporate purposes. The Credit Facilities are guaranteed by each direct and indirect wholly owned material domestic subsidiary of the Partnership, and are secured by first priority perfected liens on substantially all of the assets of the Partnership and its direct and indirect wholly owned material domestic subsidiaries, including equity interests directly owned by such entities, subject to certain customary exclusions. The Credit Facilities contain representations and warranties, affirmative and negative covenants and events of default that the Partnership considers to be customary for an agreement of this type, including a covenant that requires the Partnership to maintain a ratio of total debt to EBITDA (as defined in the Credit Facilities) for the prior four fiscal quarters of not greater than 5.00 to 1.00 as of the last day of each fiscal quarter (5.50 to 1.00 during the specified period following certain acquisitions) and, prior to the Partnership obtaining an investment grade credit rating, a ratio of secured debt to EBITDA for the prior four fiscal quarters of not greater than 4.00 to 1.00 as of the last day of each fiscal quarter. As of December 31, 2021, the Partnership was in compliance with these financial covenants.

Fair Value Measurement

At December 31, 2021, our total debt had a carrying value of $2,563.5 million and had a fair value of approximately $2,648.5 million, based on Level 2 inputs in the fair value measurement hierarchy. The carrying value of the amounts under the Term Loan A facility and revolving credit facility at December 31, 2021, approximated their fair value. Any changes in interest rates do not impact cash outflows associated with fixed rate interest payments or settlement of debt principal, unless a debt instrument is repurchased prior to maturity.

Interest Paid

The total amount of interest paid on all fixed-rate senior notes and credit facilities, including facility fees, during the years ended December 31, 2021, 2020 and 2019 was $84.5 million, $88.9 million and $60.8 million, respectively.

Partners' Capital and Distributions

12 Months Ended

Dec. 31, 2021

Partners Capital Notes [Abstract]

Partners' Capital and Distributions

Note 9. Partners’ Capital and Distributions

Shares Outstanding

Prior to the Restructuring, our partners’ capital included common and subordinated units representing limited partner interests in the Partnership. Pursuant to the Restructuring, 17,062,655 public common units of the Partnership outstanding as of December 16, 2019, were converted into Class A Shares of the Company (economic and voting) on a one-for-one basis, the Sponsors received 898,000 Class A Shares of the Company, 266,416,928 Class B Units representing noncontrolling limited partner interests in the Partnership and cash consideration of $601.8 million. In addition, our general partner purchased 266,416,928 Class B Shares of the Company (non-economic voting only) for a cash amount equal to $0.0001 per Class B Share. Class B Units of the Partnership together with the equal number of Class B Shares of the Company are convertible to Class A Shares of the Company on a one-for-one basis.

The changes in the number of shares outstanding from December 31, 2019 through December 31, 2021 are as follows:


	Class A Shares
	Public		Sponsors		Total Class A Shares		Class B Shares Sponsors			Total Class A and Class B Shares
Balance, December 31, 2019		17,062,655		898,000		17,960,655		266,416,928			284,377,583
Equity-based compensation		67,653		-		67,653		-			67,653
Balance, December 31, 2020		17,130,308		898,000		18,028,308		266,416,928			284,445,236
Equity-based compensation		118,760		-		118,760		-			118,760
Equity offering transaction - March 2021		6,900,000		-		6,900,000		(6,900,000	)		-
Equity offering transaction - October 2021		8,625,000		-		8,625,000		(8,625,000	)		-
Repurchase Transaction		-		-		-		(31,250,000	)		(31,250,000	)
Balance, December 31, 2021		32,774,068		898,000		33,672,068		219,641,928			253,313,996

Distributions

Our partnership agreement requires that, within 45 days after the end of each quarter, we distribute all of our available cash to shareholders of record on the applicable record date. The following table details the distributions declared and/or paid for the periods presented:


Period	Record Date	Distribution Date	Distribution per Class A share
First Quarter 2019	May 3, 2019	May 14, 2019	$	0.3833
Second Quarter 2019	August 5, 2019	August 13, 2019	$	0.3970
Third Quarter 2019	November 4, 2019	November 13, 2019	$	0.4112
Fourth Quarter 2019	February 6, 2020	February 14, 2020	$	0.4258
First Quarter 2020	May 4, 2020	May 14, 2020	$	0.4310
Second Quarter 2020	August 6, 2020	August 14, 2020	$	0.4363
Third Quarter 2020	November 5, 2020	November 13, 2020	$	0.4417
Fourth Quarter 2020	February 4, 2021	February 12, 2021	$	0.4471
First Quarter 2021	May 3, 2021	May 13, 2021	$	0.4526
Second Quarter 2021	August 9, 2021	August 13, 2021	$	0.5042
Third Quarter 2021	November 4, 2021	November 12, 2021	$	0.5104
Fourth Quarter 2021(1)	February 3, 2022	February 14, 2022	$	0.5167

(1)

For more information, see Note 16, Subsequent Events.

Equity-Based Compensation

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Equity-Based Compensation

Note 10. Equity-Based Compensation

We adopted the Hess Midstream LP 2017 Long-Term Incentive Plan (the “LTIP”). Awards under the LTIP are available for officers, directors and employees of our general partner or its affiliates, and any individuals who perform services for the Company. The LTIP provides the Company with the flexibility to grant restricted share awards, restricted shares, phantom units, share options, share appreciation rights, distribution equivalent rights, profits interest shares and other equity‑based awards. The LTIP limits the number of shares that may be delivered pursuant to vested awards to 3,000,000 Class A Shares.

Under the LTIP, we granted phantom unit awards with distribution equivalent rights to certain officers, employees and directors. These phantom units and distribution equivalent rights vest ratably over a three‑year period for officers and employees, and vest after one year for directors. Each phantom unit represents the right to receive one Class A Share upon vesting (or an equivalent amount of cash). Cash distributions on the phantom units accumulate and are paid upon vesting. Fair value of phantom units is based on the fair value of Class A Shares on the grant date.

Equity‑based award activity for the year ended December 31, 2021 was as follows:


				Weighted Average
				Award Date
	Number of Shares			Fair Value
Outstanding and unvested shares at December 31, 2020		228,344		$	13.78
Granted		78,347			22.40
Vested		(118,760	)		14.77
Outstanding and unvested shares at December 31, 2021		187,931		$	16.75


(in millions)	2021		2020		2019
Fair value of shares granted	$	1.8	$	1.9	$	1.7
Fair value of shares vested	$	1.8	$	1.5	$	1.0

During the year ended December 31, 2021, we recognized compensation expense related to the outstanding awards of $1.4 million (2020: $1.5 million, 2019: $1.5 million). As of December 31, 2021, $1.8 million of compensation cost related to our unvested restricted shares awarded under the LTIP remains to be recognized over an expected weighted‑average period of 1.8 years.

Earnings per Share/Limited Partner Unit

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Earnings per Share/Limited Partner Unit

Note 11. Earnings per Share/Limited Partner Unit

Earnings per limited partner unit prior to the Restructuring on December 16, 2019, were computed by dividing the respective limited partners’ interest in net income attributable to Hess Midstream Partners LP by the weighted average number of common and subordinated units outstanding. Because we had more than one class of participating securities, we used the two‑class method when calculating earnings per limited partner unit. The classes of participating securities included common units, subordinated units, general partner interest and incentive distribution rights. Our net income includes earnings related to businesses acquired through transactions between entities under common control for periods prior to their acquisition by us. We have allocated these pre-acquisition earnings to Net income attributable to net parent investment.

Subsequent to the Restructuring, we calculate earnings per Class A Share as we do not have any other participating securities. Substantially all of income tax expense is attributed to earnings of Class A Shares reflective of our organizational structure. Class B Units of the Partnership together with the equal number of Class B Shares of the Company are convertible to Class A Shares of the Company on a one-for-one basis. In addition, our restricted equity-based awards may have a dilutive effect on our earnings per share. Diluted earnings per Class A Share are calculated using the “treasury stock method” or “if-converted method”, whichever is more dilutive.


	Year Ended December 31,
(in millions, except per share amounts)	2021		2020		2019
Net income		617.8		484.9		317.7
Less: Net income attributable to net parent investment		-		-		(55.0	)
Less: Net income attributable to noncontrolling interest		571.4		460.9		302.6
Net income attributable to Hess Midstream LP		46.4		24.0		70.1
Less: General partners' interest in net income prior to the Restructuring		-		-		3.4
Limited partners' interest in net income	$	46.4	$	24.0	$	66.7
Net income attributable to Hess Midstream LP per Class A share/limited partner unit*:
Basic:	$	1.81	$	1.33	$	1.21
Diluted:	$	1.76	$	1.31	$	1.20
Weighted average Class A shares outstanding:
Basic:		25.6		18.0		18.0
Diluted:		25.7		18.1		18.0
Weighted average limited partner units outstanding prior to the Restructuring:
Basic:
Common						27.3
Subordinated						27.3
Diluted:
Common						27.5
Subordinated						27.3

For the year ended December 31, 2021, the weighted average number of Class A Shares outstanding included 103,672 dilutive restricted shares (2020: 88,013 shares). For the year ended December 31, 2019, the weighted average number of common units outstanding included 135,712 dilutive restricted units.

In computing the dilutive effect, if any, of an exchange of Class B Units of the Partnership together with the equal number of Class B Shares of the Company to Class A Shares of the Company, net income attributable to Class A shareholders is adjusted, including for additional income tax expense, due to elimination of the noncontrolling interest associated with Class B Units of the Partnership. For the year ended December 31, 2021, the “if-converted” method was more dilutive. A reconciliation of the numerator and the denominator of the diluted earnings per Class A Share calculation under the “if-converted” method for the year ended December 31, 2021, is presented below:


	Year Ended December 31,
	2021
(in millions, except per share data)
Diluted net income per share
Numerator:
Net income attributable to Hess Midstream LP	$	46.4
Effect of exchange of Class B Units of the Partnership and the equal number of Class B Shares of the Company to Class A Shares of the Company		571.4
Effect of income tax expense on additional income attributable to Hess Midstream LP(1)		(139.4	)
Diluted net income attributable to Hess Midstream LP	$	478.4
Denominator:
Basic weighted average Class A Shares outstanding		25.6
Effect of dilutive securities:
Weighted average Class B Units/Shares		246.7
Restricted equity-based awards		0.1
Diluted weighted average shares outstanding		272.4
Diluted net income attributable to Hess Midstream LP per Class A Share	$	1.76

(1) Income tax effect is calculated assuming 24.39% blended U.S. federal and state income tax rate.

Concentration of Credit Risk

12 Months Ended

Dec. 31, 2021

Risks And Uncertainties [Abstract]

Concentration of Credit Risk

Note 12. Concentration of Credit Risk

Hess represented approximately 100% of our total revenues and accounts receivable from contracts with customers for the years ended December 31, 2021, 2020 and 2019.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 13. Commitments and Contingencies

Environmental Contingencies

The Company is subject to federal, state and local laws and regulations relating to the environment. As of December 31, 2021, our reserve for estimated remediation liabilities included in Accrued liabilities and Other noncurrent liabilities was $0.8 million and $3.1 million, respectively, compared with $0.9 million and $3.1 million, respectively, as of December 31, 2020.

Legal Proceedings

As of December 31, 2021 and 2020, we did not have material accrued liabilities for any legal contingencies. Based on currently available information, we believe it is remote that the outcome of known matters would have a material adverse impact on our financial condition, results of operations or cash flows.

Lease and Purchase Obligations

As of December 31, 2021 and 2020, we did not have material lease obligations.

As of December 31 2021, we had unconditional purchase commitments of $11.9 million for the year ending December 31, 2022 and none for the years thereafter.

Segments

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Segments

Note 14. Segments

Our operations are located in the United States and are organized into three reportable segments: (i) gathering, (ii) processing and storage and (iii) terminaling and export. Our reportable segments comprise the structure used by our Chief Operating Decision Maker (“CODM”) to make key operating decisions and assess performance. These segments are strategic business units with differing products and services. The accounting policies of the segments are identical to those described in Note 2, Summary of Significant Accounting Policies and Basis of Presentation. Our CODM evaluates the segments’ operating performance based on multiple measures including Adjusted EBITDA, defined as net income (loss) before interest expense, income tax (benefit), depreciation and amortization, and our proportional share of depreciation of our equity affiliates as further adjusted for other non‑cash, non‑recurring items, if applicable.

Gathering. Our gathering segment consists of the following assets:

•

Natural Gas Gathering and Compression. A natural gas gathering and compression system located primarily in McKenzie, Williams and Mountrail Counties, North Dakota connecting Hess and third‑party owned or operated wells to the Tioga Gas Plant, LM4 gas processing plant, and third‑party pipeline facilities. The system also includes the Hawkeye Gas Facility.

•

Crude Oil Gathering: A crude oil gathering system located primarily in McKenzie, Williams, and Mountrail Counties, North Dakota, connecting Hess and third‑party owned or operated wells to the Ramberg Terminal Facility and the Johnson’s Corner Header System. The system also includes the Hawkeye Oil Facility.

•

Produced Water Gathering and Disposal. A produced water gathering system and disposal facilities located primarily in Williams and Mountrail Counties, North Dakota.

Processing and Storage. Our processing and storage segment consists of the following assets:

•

Tioga Gas Plant (TGP). A natural gas processing and fractionation plant located in Tioga, North Dakota.

•

Mentor Storage Terminal. A propane storage cavern and rail and truck loading and unloading facility located in Mentor, Minnesota.

•

Equity Investment in LM4 Joint Venture. The Partnership’s 50% equity method investment in LM4 joint venture that owns a natural gas processing plant located in McKenzie County, North Dakota, which was placed in service in the third quarter of 2019.

Terminaling and Export. Our terminaling and export segment consists of the following assets:

•

Ramberg Terminal Facility. A crude oil pipeline and truck receipt terminal located in Williams County, North Dakota that is capable of delivering crude oil into an interconnecting pipeline for transportation to the Tioga Rail Terminal and to multiple third‑party pipelines and storage facilities.

•

Tioga Rail Terminal. A crude oil and NGL rail loading terminal in Tioga, North Dakota that is connected to the Tioga Gas Plant, the Ramberg Terminal Facility and our crude oil gathering system.

•

Crude Oil Rail Cars. A total of 550 crude oil rail cars, constructed to the DOT‑117 safety standards, which we operate as unit trains consisting of approximately 100 to 110 crude oil rail cars.

•

Johnson’s Corner Header System. An approximately six‑mile crude oil pipeline header system located in McKenzie County, North Dakota that receives crude oil by pipeline from Hess and third parties and delivers crude oil to third‑party interstate pipeline systems.

The following tables reflect certain financial data for each reportable segment:


	Gathering		Processing and Storage		Terminaling and Export		Interest and Other			Consolidated
(in millions)
For the Year Ended December 31, 2021
Revenues and other income	$	630.6	$	435.7	$	137.5	$	-		$	1,203.8
Net income (loss)		377.6		263.8		103.7		(127.3	)		617.8
Net income (loss) attributable to Hess Midstream LP		36.3		25.5		10.1		(25.5	)		46.4
Depreciation expense		101.0		48.4		16.2		-			165.6
Proportional share of equity affiliates' depreciation		-		5.1		-		-			5.1
Income from equity investments		-		10.6		-		-			10.6
Interest expense, net		-		-		-		105.4			105.4
Income tax expense		-		-		-		14.6			14.6
Adjusted EBITDA		478.6		317.3		119.9		(7.3	)		908.5
Capital expenditures*		154.0		28.8		0.2		-			183.0

	Gathering		Processing and Storage		Terminaling and Export		Interest and Other			Consolidated
(in millions)
For the Year Ended December 31, 2020
Revenues and other income	$	561.9	$	370.6	$	159.4	$	-		$	1,091.9
Net income (loss)		300.7		218.7		73.5		(108.0	)		484.9
Net income (loss) attributable to Hess Midstream LP		19.2		13.7		4.7		(13.6	)		24.0
Depreciation expense		96.0		44.8		16.1		-			156.9
Proportional share of equity affiliates' depreciation		-		5.1		-		-			5.1
Income from equity investments		-		10.3		-		-			10.3
Interest expense, net		-		-		-		94.7			94.7
Income tax expense (benefit)		-		-		-		7.3			7.3
Gain on sale of property, plant and equipment		0.1		-		-		-			0.1
Adjusted EBITDA		396.6		268.6		89.6		(6.0	)		748.8
Capital expenditures*		96.2		156.2		0.6		-			253.0


	Gathering		Processing and Storage		Terminaling and Export		Interest and Other			Consolidated
(in millions)
For the Year Ended December 31, 2019
Revenues and other income	$	422.9	$	295.3	$	130.1	$	-		$	848.3
Net income (loss)		186.0		176.1		54.8		(99.2	)		317.7
Net income (loss) attributable to Hess Midstream LP		34.6		34.6		10.5		(9.6	)		70.1
Depreciation expense		81.6		44.7		16.2		-			142.5
Proportional share of equity affiliates' depreciation		-		2.0		-		-			2.0
Income from equity investments		-		3.4		-		-			3.4
Interest expense, net		-		-		-		62.4			62.4
Income tax expense (benefit)		-		-		-		(0.1	)		(0.1	)
Transaction costs		-		-		-		26.2			26.2
Adjusted EBITDA		267.6		222.8		71.0		(10.7	)		550.7
Capital expenditures*		373.6		42.5		0.2		-			416.3

* Includes acquisition, expansion, and maintenance capital expenditures.

Total assets for reportable segments are as follows:



	December 31, 2021		December 31, 2020
(in millions)
Gathering	$	1,927.0	$	1,856.2
Processing and Storage(1)		1,149.5		1,170.3
Terminaling and Export		281.4		292.3
Interest and Other		127.7		55.7
Total assets	$	3,485.6	$	3,374.5

(1)

Includes investment in equity investees of $101.6 million as of December 31, 2021 and $108.4 million as of December 31, 2020.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Income Taxes

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Note 15. Income Taxes

Although the Company is a Delaware limited partnership, we are subject to corporate income tax on our share of the Partnership’s earnings because of our election to be treated as a corporation for U.S. federal and state income tax purposes. The provision (benefit) for income taxes consisted of:


	Year Ended December 31,
(in millions)	2021		2020		2019
Federal
Current	$	0.1	$	-	$	-
Deferred taxes and other accruals		12.5		6.2		(0.1	)
State		2.0		1.1		-
Total provision (benefit) for income taxes	$	14.6	$	7.3	$	(0.1	)

The difference between the effective income tax rate and the U.S. statutory rate is reconciled below:


	Year Ended December 31,
	2021				2020				2019
U.S. statutory rate		21.0		%		21.0		%		21.0		%
Non-taxable income from pre-Restructuring period		-				-				(21.4	)
Noncontrolling interest in partnership		(19.0	)			(19.7	)			0.4
State tax		0.3				0.2				-
Effective rate		2.3		%		1.5		%		-		%

On March 1, 2019, HIP acquired Hess Water Services (see Note 4, Acquisitions). For the periods prior to March 1, 2019, Hess Water Services was included in the consolidated income tax returns of Hess. The provision for Hess Water Services’ income taxes and income tax assets and liabilities were determined as if it were a standalone taxpayer for all periods presented.

Prior to the Restructuring on December 16, 2019, the Partnership was not a separate taxable entity for U.S. federal and state income tax purposes; therefore, we did not recognize income tax expense or benefit in those periods. Each partner was subject to income taxes on its share of the Partnership’s earnings. In connection with the Restructuring, we became a partial owner of the Partnership and recognize income tax expense or benefit on our allocable share of the Partnership’s income or loss subsequent to the Restructuring. As part of the Restructuring, we recognized a deferred tax asset of $49.8 million for the temporary differences related to our investment in the Partnership. The effect of recognizing the deferred tax asset was included in Class A shareholders’ equity balance in the accompanying consolidated statement of changes in partners’ capital due to the Restructuring being characterized as a transaction among or with shareholders.

In addition, as a result of the equity offering transactions on March 15, 2021 and October 8, 2021, as well as the Repurchase Transaction on August 10, 2021 (see Note 3, Equity Transactions), we recognized an additional deferred tax asset in the total amount of $89.0 million related to the change in the temporary difference between carrying amount and tax basis of our investment in the Partnership. The effect of recognizing the additional deferred tax asset was included in Class A shareholders’ equity balance in the accompanying consolidated statement of changes in partners’ capital due to the transactions being characterized as transactions among or with shareholders.

The components of deferred tax assets and liabilities are as follows:


	December 31,
	2021			2020
(in millions)
Deferred tax liabilities
Investments	$	(0.4	)	$	(0.3	)
Total deferred tax liabilities		(0.4	)		(0.3	)
Deferred tax assets
Investments		102.3			39.0
Net operating loss carryforwards		15.0			3.8
Total deferred tax assets		117.3			42.8
Net deferred tax assets (liabilities)	$	116.9		$	42.5

At December 31, 2021, we have recognized a deferred tax asset of $12.4 million related to U.S. federal net operating loss carryforwards which do not expire and $2.6 million related to U.S. state net operating loss carryforwards which begin to expire in 2040. We have no unrecognized tax benefits or interest and penalties related to tax liabilities recorded in the financial statements. For the years presented, we earned all net income before taxes in the United States. We file income tax returns in the U.S. and various states. We are not subject to corporate income tax examination for years prior to 2019.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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Summary of Hess Water Services Acquisition

Subsequent Events

12 Months Ended

Dec. 31, 2021

Subsequent Events [Abstract]

Subsequent Events

Note 16. Subsequent Events

On January 24, 2022 the board of directors of our general partner declared a quarterly cash distribution of $0.5167 per Class A Share for the quarter ended December 31, 2021, an increase of approximately 15.6% compared with the quarter ended December 31, 2020. The distribution was paid on February 14, 2022 to shareholders of record as of the close of business on February 3, 2022. On February 14, 2022, the Partnership also made a distribution of $0.5167 per Class B Unit of the Partnership to the Sponsors as holders of an aggregate of 219,641,928 Class B Units of the Partnership.

Summary of Significant Accounting Policies and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Consolidation	Consolidation. The consolidated financial statements include our accounts and the accounts of entities over which we have a controlling financial interest through our ownership or the majority voting interests of the entity. We consolidate the activities of the Partnership, and prior to the Restructuring the activities of Gathering Opco, HTGP Opco and Logistics Opco, each as a variable interest entity (“VIE”) under U.S. Generally Accepted Accounting Principles (“GAAP”). We have concluded that we are the primary beneficiary of the VIE, as defined in the accounting standards, since we have the power, through our ownership, to direct those activities that most significantly impact the economic performance of the Partnership. This conclusion was based on a qualitative analysis that considered the Partnership’s governance structure and the delegation of control provisions, which provide us the ability to control the operations of the Partnership. All financial statement activities associated with the VIE are captured within gathering, processing and storage, and terminaling and export segments (see Note 14, Segments). At December 31, 2021, our noncontrolling interest represents the 86.7% interest in the Partnership retained by Hess and GIP (2020: 93.7%). Prior to the Restructuring, our noncontrolling interest represented the 80% interest in the Joint Interest Assets retained by HIP. All intercompany transactions and balances have been eliminated.
Use of Estimates	Use of Estimates. We prepare our consolidated financial statements in conformity with the U.S. GAAP, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the years presented. Changes in facts and circumstances may result in revised estimates and actual results could differ from those estimates.
Common Control Transactions	Common Control Transactions. Assets and businesses acquired from Hess and its subsidiaries are accounted for as common control transactions whereby the net assets acquired are combined with net assets of the Company at Hess’ historical carrying value. If any recognized consideration transferred in such a transaction exceeds the carrying value of the net assets acquired, the excess is treated as a capital distribution to Hess, similar to a dividend. To the extent that such transactions require prior periods to be retrospectively adjusted, historical net equity amounts prior to the transaction date are reflected in “Net Parent Investment.” Cash consideration up to the carrying value of net assets acquired is presented as an investing activity in our consolidated statement of cash flows. Cash consideration in excess of the carrying value of net assets acquired is presented as a financing activity in our consolidated statement of cash flows.
Cash and Cash Equivalents	Cash and Cash Equivalents. Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have maturities of three months or less when acquired.
Accounts Receivable	Accounts Receivable. We record affiliate accounts receivable upon performance of services to affiliated companies. Generally, we receive payments from affiliated companies on a monthly basis, shortly after performance of services. There were no doubtful accounts written off, nor have we provided an allowance for doubtful accounts, as of December 31, 2021 and 2020.
Property, Plant and Equipment	Property, Plant and Equipment. Property, plant and equipment are stated at the lower of historical cost less accumulated depreciation subject to the results of impairment testing. We capitalize all construction-related direct labor and material costs, as well as indirect construction costs. Indirect construction costs include general engineering, taxes and the cost of funds used during construction. Costs, including complete asset replacements and enhancements or upgrades that increase the original efficiency, productivity or capacity of property, plant and equipment, are also capitalized. The costs of repairs, minor replacements and other projects, which do not increase the original efficiency, productivity or capacity of property, plant and equipment, are expensed as incurred.
Capitalization of Interest	Capitalization of Interest. Interest charges from borrowings are capitalized on material projects using the weighted average cost of outstanding borrowings until the project is substantially complete and ready for its intended use. Capitalized interest is depreciated over the useful lives of the assets in the same manner as the depreciation of the underlying assets.
Impairment of Long-Lived Assets	Impairment of Long‑Lived Assets. We review long-lived assets for impairment whenever events or changes in business circumstances indicate the net book values of the assets may not be recoverable. Factors that indicate potential impairment include a significant decrease in the market value of the asset, operating or cash flow losses associated with the use of the asset, and a significant change in the asset’s physical condition or use. Impairment is indicated when the undiscounted cash flows estimated to be generated by those assets are less than the assets’ net book value. Undiscounted cash flows are based on identifiable cash flows that are largely independent of the cash flows of other assets and liabilities. If impairment occurs, a loss is recognized for the difference between the fair value and net book value. Such fair value is generally determined by discounting anticipated future net cash flows, an income valuation approach, or by a market-based valuation approach, which are Level 3 fair value measurements. No impairments of long‑lived assets were recorded during the years ended December 31, 2021, 2020 and 2019.
Leases	Leases. We determine if an arrangement is a lease at inception. Operating lease right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The operating lease right-of-use asset includes any initial direct costs and excludes lease incentives received. The lease term used in measurement of our lease obligations may include periods covered by an option to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has elected not to recognize lease assets and lease liabilities for leases with a term of 12 months or less for all classes of underlying assets. Our lease agreements may include lease and non-lease components, which are generally accounted for separately.
Equity Investments	Equity Investments. We account for our investment in LM4 under the equity method of accounting, as we do not control, but have a significant influence over, its operations. During the year ended December 31, 2019, we capitalized $4.1 million of interest expense associated with our investment in LM4. Difference in the basis of the investment and the underlying net asset value of the equity investee is amortized into net income over the remaining useful lives of the underlying assets. Earnings from equity investments represent our proportionate share of net income generated by the equity investee. We classify distributions received from equity method investees on the basis of the nature of the activity of the investee that generated the distribution as either a return on investment classified as cash inflows from operating activities or a return of investment classified as cash inflows from investing activities when such information is available to us.
Deferred Financing Costs	Deferred Financing Costs. We capitalize debt issuance costs and fees incurred related to the procurement of our credit facilities. We amortize such costs as additional interest expense over the life of the credit agreement using the straight-line method, which approximates the effective interest method. Unamortized deferred financing costs related to our revolving credit facility are presented in Other noncurrent assets (2021: $6.9 million, 2020: $9.3 million) and unamortized deferred financing costs and discounts related to our fixed-rate senior notes and our term loan are presented as a direct reduction to the Long-term debt (2021: $30.5 million, 2020: $23.9 million) in the accompanying consolidated balance sheets.
Asset Retirement Obligations	Asset Retirement Obligations. We record legal obligations to remove and dismantle long-lived assets. We recognize a liability for the fair value of legally required asset retirement obligations associated with long-lived assets in the period in which the retirement obligations are incurred if the liability can be reasonably estimated. The associated asset retirement costs are capitalized as part of the carrying amount of the long-lived assets. Accretion expense is included in Depreciation expense in the consolidated statement of operations. At December 31, 2021, the asset retirement obligation balance included in Other noncurrent liabilities was $11.0 million and the current portion included in Accrued liabilities was $3.0 million (2020: $12.8 million and $1.7 million, respectively).
Net Parent Investment	Net Parent Investment. Net parent investment represents HIP’s historical activity as well as Hess’ historical investment in Hess Water Services prior to its acquisition by HIP, the accumulated net operating results through the date when we obtained control of HIP, and the net effect of transactions between HIP and the Sponsors, and between Hess and Hess Water Services. Retrospectively adjusted financial information from prior to the acquisition of HIP is included in Net parent investment.
Revenue Recognition	Revenue Recognition—Contracts with Customers. We earn substantially all of our revenues by charging fees for gathering, compressing and processing natural gas and fractionating NGLs; gathering, terminaling, loading and transporting crude oil and NGLs, gathering and disposing produced water, and storing and terminaling propane. We do not own or take title to the volumes that we handle. Effective January 1, 2014, we entered into (i) gas gathering, (ii) crude oil gathering, (iii) gas processing and fractionation, (iv) storage services and (v) terminal and export services fee‑based commercial agreements with certain subsidiaries of Hess, and effective January 1, 2019, we entered into water gathering and disposal services fee-based agreements with a subsidiary of Hess. Our responsibilities to provide each of the above services for each year under each of the commercial agreements are considered separate, distinct performance obligations. We recognize revenues for each performance obligation under our commercial agreements over‑time as services are rendered using the output method, measured using the amount of volumes serviced during the period. The minimum volume commitments are subject to fluctuation based on nominations covering substantially all of Hess’ production and projected third-party volumes that will be purchased in the Bakken. As the minimum volume commitments are subject to fluctuation, and these commercial agreements contain fee inflation escalators and fee recalculation mechanisms, substantially all of the transaction price, as this term is defined in Accounting Standards Codification (“ASC”) Topic, ASC 606, is variable at inception of each of the commercial agreements. As the variability is resolved prior to the recognition of revenue, we do not apply a constraint to the transaction price at the inception of the commercial agreements. We elected the practical expedient to recognize revenue in the amount to which we have a right to invoice as permitted under ASC 606. Due to this election and as the transaction price allocated to our unsatisfied performance obligations is entirely variable, we have elected the exemption provided by ASC 606 from the disclosure of revenue recognizable in future periods as our unsatisfied performance obligations are fulfilled. There are no significant financing components in any of our commercial agreements. The minimum volumes that Hess provides to our assets under our commercial agreements include dedicated production covering substantially all of Hess’ existing and future owned or controlled production in the Bakken and projected third-party volumes owned or controlled by Hess through dedicated third-party contracts. If Hess delivers volumes less than the applicable minimum volume commitments under our commercial agreements during any quarter, Hess is obligated to pay us a shortfall fee equal to the volume deficiency multiplied by the related gathering, processing and/or terminaling fee, as applicable. Our responsibility to stand-ready to service a minimum volume over each quarterly commitment period represents a separate, distinct performance obligation. Currently, and for the remainder of the Initial Term of each commercial agreement as described in Note 5, volume deficiencies are measured quarterly and recognized as revenue in the same period, as any associated shortfall payments are not subject to future reduction or offset. During the Secondary Term of each commercial agreement as described in Note 5, Hess will be entitled to receive a credit, calculated in barrels or Mcf, as applicable, with respect to the amount of any shortfall fee paid by Hess, which will initially be reported in deferred revenue. Hess may apply such credit against the fees payable for any volumes delivered to us under the applicable agreement in excess of Hess’ nominated volumes up to four quarters after such credit is earned. Unused credits by Hess will be recognized as revenue when they expire after four quarters. However, Hess will not be entitled to receive any such credit with respect to crude oil terminaling services under our terminal and export services agreement. Our revenues also include pass‑through third‑party rail transportation costs, third-party produced water trucking and disposal costs, electricity fees and certain other fees for which we recognize revenues in an amount equal to the costs.
Depreciation Expense	Depreciation Expense. We calculate depreciation using the straight-line method based on the estimated useful lives after considering salvage values of our assets. Depreciation lives range from 12 to 35 years. However, factors such as maintenance levels, economic conditions impacting the demand for these assets, and regulatory or environmental requirements could cause us to change our estimates, thus impacting the future calculation of depreciation.
Equity-Based Compensation	Equity‑Based Compensation. Equity‑based compensation issued to the officers, directors and employees of our general partner is recorded at grant‑date fair value. Expense is recognized on a straight‑line basis over the vesting period of the award and is included in General and administrative expenses in the accompanying consolidated statements of operations. Forfeitures are recognized as they occur.
Income Taxes	Income Taxes. Deferred income taxes are determined using the liability method and reflect temporary differences between the financial statement carrying amount and income tax basis of assets and liabilities recorded using the statutory income tax rate. Regular assessments are made of the likelihood of those deferred tax assets being realized. If it is more likely than not that some or all of the deferred tax assets will not be realized, a valuation allowance is recorded to reduce the deferred tax assets to the amount expected to be realized. Prior to the Restructuring on December 16, 2019, we were not a separate taxable entity for U.S. federal and state income tax purposes; therefore, we did not provide for income tax benefit or expense. Each partner was subject to income taxes on its share of the Partnership’s earnings. On March 1, 2019, HIP acquired Hess Water Services (see Note 4, Acquisitions). For the periods prior to March 1, 2019, Hess Water Services was included in the consolidated income tax returns of Hess. The provision for Hess Water Services’ income taxes and income tax assets and liabilities were determined as if it were a standalone taxpayer for all periods presented. For the period from March 1, 2019 through the Restructuring date of December 16, 2019, Hess Water Services was not taxable itself and was not part of a separate taxable entity; therefore, no income tax provision was recognized.
Net Income per Limited Partner Unit	Net Income Per Limited Partner Unit. Prior to the Restructuring, we identified the general partner interest and IDRs as participating securities and computed income per unit using the two‑class method under which net income per unit was calculated for common units and participating securities considering both distributions declared and participation rights in undistributed earnings as if all such earnings had been distributed during that period. Net income per unit applicable to limited partners, including subordinated unitholders, was computed by dividing limited partners' interest in net income, after deducting the general partner's 2% interest and IDRs, by the weighted‑average number of outstanding common and subordinated units.
Environmental and Legal Contingencies	Environmental and Legal Contingencies. We accrue and expense environmental costs on an undiscounted basis to remediate existing conditions related to past operations when the future costs are probable and reasonably estimable. In the ordinary course of business, the Company is from time to time party to various judicial and administrative proceedings. We regularly assess the need for accounting recognition or disclosure of these contingencies. In the case of a known contingency, we accrue a liability when the loss is probable and the amount is reasonably estimable. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued.
Fair Value Measurements	Fair Value Measurements. We measure assets and liabilities requiring fair value presentation using an exit price (i.e., the price that would be received to sell an asset or paid to transfer a liability) and disclose such amounts according to the level of valuation inputs under the following hierarchy: Level 1: Quoted prices in an active market for identical assets or liabilities. Level 2: Inputs other than quoted prices that are directly or indirectly observable. Level 3: Unobservable inputs that are significant to the fair value of assets or liabilities. The classification of an asset or liability within the fair value measurement hierarchy is based on the lowest level of input significant to its fair value. There were no nonrecurring fair value measurements during the years ended December 31, 2021 and 2020. We had other short‑term financial instruments, primarily cash and cash equivalents, accounts receivable and accounts payable, for which the carrying value approximated their fair value as of December 31, 2021 and 2020.
Derivatives	Derivatives. We may utilize derivative instruments for financial risk management activities. In these activities, we may use futures, forwards, options and swaps, individually or in combination, to mitigate our exposure to fluctuations in interest rates. All derivative instruments are recorded at fair value in our consolidated balance sheet. Our policy for recognizing the changes in fair value of derivatives varies based on the designation of the derivative. The changes in fair value of derivatives that are not designated as hedges are recognized in earnings. Derivatives may be designated as hedges of expected future cash flows or forecasted transactions (cash flow hedges). Changes in fair value of derivatives that are designated as cash flow hedges are recorded as a component of other comprehensive income (loss). Amounts included in Accumulated other comprehensive income (loss) for cash flow hedges are reclassified into earnings in the same period that the hedged item is recognized in earnings.
New Accounting Pronouncements	New Accounting Pronouncements In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2020-04, Reference Rate Reform, as a new ASC Topic, ASC 848 and also issued subsequent amendments to the initial guidance (collectively, “ASC 848”). The purpose of ASC 848 is to provide optional guidance to ease the potential effects on financial reporting of the market-wide migration away from Interbank Offered Rates, such as London Interbank Offered Rate (“LIBOR”) to alternative reference rates. ASC 848 applies only to contracts, hedging relationships, debt arrangements and other transactions that reference a benchmark reference rate expected to be discontinued because of reference rate reform. ASC 848 contains optional expedients and exceptions for applying U.S. GAAP to transactions affected by this reform. The amendments in the ASU are effective for all entities through December 31, 2022. Borrowing under our Credit Facilities bear interest at LIBOR plus an applicable margin (see Note 8, Debt and Interest Expense). Although our Credit Facilities mature in 2024, they include provisions for transition to an alternative reference rate without interruption in our ability to borrow under these Credit Facilities. We do not expect our adoption of ASC 848 or transition to an alternative reference rate will have a material impact on our consolidated financial statements.

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2021

Business Combinations [Abstract]

In connection with the Hess Water Services acquisition, HIP acquired the following:


(in millions)
Property, plant and equipment, net	$	70.8
Working capital		(1.2	)
Asset retirement obligations		(0.7	)
Net assets acquired	$	68.9

Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2021

Summary of Revenues From Contracts With Customers on Disaggregated Basis

Revenues from contracts with customers on a disaggregated basis were as follows:


	Year Ended December 31,
	2021		2020		2019
(in millions)
Oil and gas gathering services	$	540.4	$	469.3	$	345.6
Processing and storage services		435.7		370.3		294.7
Terminaling and export services		137.5		159.4		130.0
Water gathering and disposal services		90.2		92.6		77.3
Total revenues from contracts with customers	$	1,203.8	$	1,091.6	$	847.6
Other income		-		0.3		0.7
Total revenues	$	1,203.8	$	1,091.9	$	848.3

Summary of MVC Shortfall Fees Earned

The following table presents MVC shortfall fees earned during each period:


	Year Ended December 31,
	2021		2020		2019
(in millions)
Oil and gas gathering services	$	43.0	$	12.5	$	5.0
Terminaling and export services		32.8		4.8		2.2
Water gathering and disposal services		6.8		1.4		1.1
Processing and storage services		4.4		-		-
Total	$	87.0	$	18.7	$	8.3

Summary of Third-party Pass-through Costs for Which Revenues in Amount Equal to Costs are Recognized and Classification of Charges between Operating and Maintenance Expenses and General and Administrative Expenses


	Year Ended December 31,
	2021		2020		2019
(in millions)
Electricity and other related fees	$	50.3	$	40.0	$	32.2
Produced water trucking and disposal costs		37.0		55.9		57.7
Rail transportation costs		0.1		50.7		40.2
Total	$	87.4	$	146.6	$	130.1


	Year Ended December 31,
	2021		2020		2019
(in millions)
Operating and maintenance expenses	$	63.6	$	62.8	$	53.1
General and administrative expenses		15.4		15.1		15.5
Total	$	79.0	$	77.9	$	68.6

Summary of Activity Related to Agreements with Related Party

For the years ended December 31, 2021, 2020 and 2019, we had the following activity related to our agreements with LM4:


	Year Ended December 31,
	2021		2020		2019
(in millions)
Processing fee incurred	$	27.7	$	25.6	$	6.3
Earnings from equity investments	$	10.6	$	10.3	$	3.4
Distributions received from equity investments	$	17.4	$	9.7	$	-

Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Property Plant And Equipment [Abstract]

Components of Property, Plant and Equipment

Property, plant and equipment, at cost, is as follows:


	Estimated useful lives	December 31, 2021			December 31, 2020
(in millions, except for number of years)
Gathering assets
Pipelines	22 years	$	1,489.7		$	1,470.6
Compressors, pumping stations and terminals	22 to 25 years		809.0			778.6
Gas plant assets
Pipelines, pipes and valves	22 to 25 years		460.0			460.0
Equipment	12 to 30 years		428.3			428.3
Processing and fractionation facilities	25 years		408.7			189.0
Buildings	35 years		182.3			182.3
Logistics facilities and railcars	20 to 25 years		386.5			386.2
Storage facilities	20 to 25 years		19.5			19.5
Other	20 to 25 years		25.8			20.9
Construction-in-progress	N/A		131.6			227.3
Total property, plant and equipment, at cost			4,341.4			4,162.7
Accumulated depreciation			(1,216.4	)		(1,051.4	)
Property, plant and equipment, net		$	3,125.0		$	3,111.3

Accrued Liabilities and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Accrued Liabilities Current [Abstract]

Schedule of Accrued Liabilities

Accrued liabilities are as follows:


	December 31, 2021		December 31, 2020
(in millions)
Accrued interest	$	30.9	$	18.0
Accrued capital expenditures		26.5		13.6
Other accruals		18.8		22.5
Total	$	76.2	$	54.1

Debt and Interest Expense (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Summary of Total Long-term Debt

Total long-term debt is as follows:


	December 31, 2021			December 31, 2020
(in millions)
Fixed-rate senior notes:
5.625% due 2026	$	800.0		$	800.0
5.125% due 2028		550.0			550.0
4.250% due 2030		750.0			-
Total fixed-rate senior notes		2,100.0			1,350.0
Term Loan A facility		390.0			400.0
Revolving credit facility		104.0			184.0
Total Borrowings		2,594.0			1,934.0
Unamortized deferred financing costs and discounts		(30.5	)		(23.9	)
Total debt		2,563.5			1,910.1
Less: current maturities of long-term debt		20.0			10.0
Total long-term debt	$	2,543.5		$	1,900.1

Summary of Maturity Profile of Total Debt, Excluding Deferred Financing Costs and Discounts

As of December 31, 2021, the maturity profile of total debt, excluding deferred financing costs and discounts, is as follows:


(in millions)	Total		2022		2023		2024		2025		2026		2027 and thereafter
Fixed-rate senior notes	$	2,100.0	$	-	$	-	$	-	$	-	$	800.0	$	1,300.0
Term Loan facility		390.0		20.0		30.0		340.0		-		-		-
Revolving credit facility		104.0		-		-		104.0		-		-		-
Total debt (excluding interest)	$	2,594.0	$	20.0	$	30.0	$	444.0	$	-	$	800.0	$	1,300.0

Partners' Capital and Distributions (Tables)

12 Months Ended

Dec. 31, 2021

Partners Capital Notes [Abstract]

Schedule of Changes in Number of Shares Outstanding

The changes in the number of shares outstanding from December 31, 2019 through December 31, 2021 are as follows:


	Class A Shares
	Public		Sponsors		Total Class A Shares		Class B Shares Sponsors			Total Class A and Class B Shares
Balance, December 31, 2019		17,062,655		898,000		17,960,655		266,416,928			284,377,583
Equity-based compensation		67,653		-		67,653		-			67,653
Balance, December 31, 2020		17,130,308		898,000		18,028,308		266,416,928			284,445,236
Equity-based compensation		118,760		-		118,760		-			118,760
Equity offering transaction - March 2021		6,900,000		-		6,900,000		(6,900,000	)		-
Equity offering transaction - October 2021		8,625,000		-		8,625,000		(8,625,000	)		-
Repurchase Transaction		-		-		-		(31,250,000	)		(31,250,000	)
Balance, December 31, 2021		32,774,068		898,000		33,672,068		219,641,928			253,313,996

Schedule of Distributions Declared and Paid

The following table details the distributions declared and/or paid for the periods presented:


Period	Record Date	Distribution Date	Distribution per Class A share
First Quarter 2019	May 3, 2019	May 14, 2019	$	0.3833
Second Quarter 2019	August 5, 2019	August 13, 2019	$	0.3970
Third Quarter 2019	November 4, 2019	November 13, 2019	$	0.4112
Fourth Quarter 2019	February 6, 2020	February 14, 2020	$	0.4258
First Quarter 2020	May 4, 2020	May 14, 2020	$	0.4310
Second Quarter 2020	August 6, 2020	August 14, 2020	$	0.4363
Third Quarter 2020	November 5, 2020	November 13, 2020	$	0.4417
Fourth Quarter 2020	February 4, 2021	February 12, 2021	$	0.4471
First Quarter 2021	May 3, 2021	May 13, 2021	$	0.4526
Second Quarter 2021	August 9, 2021	August 13, 2021	$	0.5042
Third Quarter 2021	November 4, 2021	November 12, 2021	$	0.5104
Fourth Quarter 2021(1)	February 3, 2022	February 14, 2022	$	0.5167

(1)

For more information, see Note 16, Subsequent Events.

Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Equity-based Award Activity

Equity‑based award activity for the year ended December 31, 2021 was as follows:


				Weighted Average
				Award Date
	Number of Shares			Fair Value
Outstanding and unvested shares at December 31, 2020		228,344		$	13.78
Granted		78,347			22.40
Vested		(118,760	)		14.77
Outstanding and unvested shares at December 31, 2021		187,931		$	16.75


(in millions)	2021		2020		2019
Fair value of shares granted	$	1.8	$	1.9	$	1.7
Fair value of shares vested	$	1.8	$	1.5	$	1.0

Earnings per Share/Limited Partner Unit (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Earnings per Share Limited Partner Unit


	Year Ended December 31,
(in millions, except per share amounts)	2021		2020		2019
Net income		617.8		484.9		317.7
Less: Net income attributable to net parent investment		-		-		(55.0	)
Less: Net income attributable to noncontrolling interest		571.4		460.9		302.6
Net income attributable to Hess Midstream LP		46.4		24.0		70.1
Less: General partners' interest in net income prior to the Restructuring		-		-		3.4
Limited partners' interest in net income	$	46.4	$	24.0	$	66.7
Net income attributable to Hess Midstream LP per Class A share/limited partner unit*:
Basic:	$	1.81	$	1.33	$	1.21
Diluted:	$	1.76	$	1.31	$	1.20
Weighted average Class A shares outstanding:
Basic:		25.6		18.0		18.0
Diluted:		25.7		18.1		18.0
Weighted average limited partner units outstanding prior to the Restructuring:
Basic:
Common						27.3
Subordinated						27.3
Diluted:
Common						27.5
Subordinated						27.3

Summary of Reconciliation of Numerator and Denominator of Diluted Earnings

A reconciliation of the numerator and the denominator of the diluted earnings per Class A Share calculation under the “if-converted” method for the year ended December 31, 2021, is presented below:


	Year Ended December 31,
	2021
(in millions, except per share data)
Diluted net income per share
Numerator:
Net income attributable to Hess Midstream LP	$	46.4
Effect of exchange of Class B Units of the Partnership and the equal number of Class B Shares of the Company to Class A Shares of the Company		571.4
Effect of income tax expense on additional income attributable to Hess Midstream LP(1)		(139.4	)
Diluted net income attributable to Hess Midstream LP	$	478.4
Denominator:
Basic weighted average Class A Shares outstanding		25.6
Effect of dilutive securities:
Weighted average Class B Units/Shares		246.7
Restricted equity-based awards		0.1
Diluted weighted average shares outstanding		272.4
Diluted net income attributable to Hess Midstream LP per Class A Share	$	1.76

(1) Income tax effect is calculated assuming 24.39% blended U.S. federal and state income tax rate.

Segments (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Financial Data for Each Reportable Segment

The following tables reflect certain financial data for each reportable segment:


	Gathering		Processing and Storage		Terminaling and Export		Interest and Other			Consolidated
(in millions)
For the Year Ended December 31, 2021
Revenues and other income	$	630.6	$	435.7	$	137.5	$	-		$	1,203.8
Net income (loss)		377.6		263.8		103.7		(127.3	)		617.8
Net income (loss) attributable to Hess Midstream LP		36.3		25.5		10.1		(25.5	)		46.4
Depreciation expense		101.0		48.4		16.2		-			165.6
Proportional share of equity affiliates' depreciation		-		5.1		-		-			5.1
Income from equity investments		-		10.6		-		-			10.6
Interest expense, net		-		-		-		105.4			105.4
Income tax expense		-		-		-		14.6			14.6
Adjusted EBITDA		478.6		317.3		119.9		(7.3	)		908.5
Capital expenditures*		154.0		28.8		0.2		-			183.0

	Gathering		Processing and Storage		Terminaling and Export		Interest and Other			Consolidated
(in millions)
For the Year Ended December 31, 2020
Revenues and other income	$	561.9	$	370.6	$	159.4	$	-		$	1,091.9
Net income (loss)		300.7		218.7		73.5		(108.0	)		484.9
Net income (loss) attributable to Hess Midstream LP		19.2		13.7		4.7		(13.6	)		24.0
Depreciation expense		96.0		44.8		16.1		-			156.9
Proportional share of equity affiliates' depreciation		-		5.1		-		-			5.1
Income from equity investments		-		10.3		-		-			10.3
Interest expense, net		-		-		-		94.7			94.7
Income tax expense (benefit)		-		-		-		7.3			7.3
Gain on sale of property, plant and equipment		0.1		-		-		-			0.1
Adjusted EBITDA		396.6		268.6		89.6		(6.0	)		748.8
Capital expenditures*		96.2		156.2		0.6		-			253.0


	Gathering		Processing and Storage		Terminaling and Export		Interest and Other			Consolidated
(in millions)
For the Year Ended December 31, 2019
Revenues and other income	$	422.9	$	295.3	$	130.1	$	-		$	848.3
Net income (loss)		186.0		176.1		54.8		(99.2	)		317.7
Net income (loss) attributable to Hess Midstream LP		34.6		34.6		10.5		(9.6	)		70.1
Depreciation expense		81.6		44.7		16.2		-			142.5
Proportional share of equity affiliates' depreciation		-		2.0		-		-			2.0
Income from equity investments		-		3.4		-		-			3.4
Interest expense, net		-		-		-		62.4			62.4
Income tax expense (benefit)		-		-		-		(0.1	)		(0.1	)
Transaction costs		-		-		-		26.2			26.2
Adjusted EBITDA		267.6		222.8		71.0		(10.7	)		550.7
Capital expenditures*		373.6		42.5		0.2		-			416.3

* Includes acquisition, expansion, and maintenance capital expenditures.

Total Assets for Reportable Segments

Total assets for reportable segments are as follows:



	December 31, 2021		December 31, 2020
(in millions)
Gathering	$	1,927.0	$	1,856.2
Processing and Storage(1)		1,149.5		1,170.3
Terminaling and Export		281.4		292.3
Interest and Other		127.7		55.7
Total assets	$	3,485.6	$	3,374.5

(1)

Includes investment in equity investees of $101.6 million as of December 31, 2021 and $108.4 million as of December 31, 2020.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Provision (Benefit) for Income Taxes

The provision (benefit) for income taxes consisted of:


	Year Ended December 31,
(in millions)	2021		2020		2019
Federal
Current	$	0.1	$	-	$	-
Deferred taxes and other accruals		12.5		6.2		(0.1	)
State		2.0		1.1		-
Total provision (benefit) for income taxes	$	14.6	$	7.3	$	(0.1	)

Summary of Difference between the Effective Income Tax Rate and U.S. Statutory Rate

The difference between the effective income tax rate and the U.S. statutory rate is reconciled below:


	Year Ended December 31,
	2021				2020				2019
U.S. statutory rate		21.0		%		21.0		%		21.0		%
Non-taxable income from pre-Restructuring period		-				-				(21.4	)
Noncontrolling interest in partnership		(19.0	)			(19.7	)			0.4
State tax		0.3				0.2				-
Effective rate		2.3		%		1.5		%		-		%

Components of Deferred Tax Assets and Liabilities

The components of deferred tax assets and liabilities are as follows:


	December 31,
	2021			2020
(in millions)
Deferred tax liabilities
Investments	$	(0.4	)	$	(0.3	)
Total deferred tax liabilities		(0.4	)		(0.3	)
Deferred tax assets
Investments		102.3			39.0
Net operating loss carryforwards		15.0			3.8
Total deferred tax assets		117.3			42.8
Net deferred tax assets (liabilities)	$	116.9		$	42.5

Description of Business - Additional Information (Detail) $ in Millions				12 Months Ended
	Dec. 16, 2019 USD ($) shares	Oct. 03, 2019	Apr. 10, 2017 shares	Dec. 31, 2021 Segment shares MMcf	Dec. 31, 2020 shares MMcf	Dec. 31, 2019 shares	Sep. 30, 2019	Jan. 25, 2018 MMcf	Jan. 24, 2018
Description Of Business [Line Items]
Number of operating segments \| Segment				3
Percentage of noncontrolling economic interest				86.70%	93.70%
Percentage of ownership interest				13.30%	6.30%
Number of units hold in partnership				253,313,996	284,445,236	284,377,583
LM4
Description Of Business [Line Items]
Percentage of ownership in joint venture							50.00%	50.00%	50.00%
Gas processing plant capacity \| MMcf								200
LM4 \| Targa Resources Corp.
Description Of Business [Line Items]
Percentage of ownership in joint venture								50.00%	50.00%
Class B Shares
Description Of Business [Line Items]
Common and subordinated units issued				219,641,928	266,416,928
Number of units hold in partnership				219,641,928	266,416,928	266,416,928
Common Class A
Description Of Business [Line Items]
Common and subordinated units issued				33,672,068	18,028,308
Number of units hold in partnership				33,672,068	18,028,308	17,960,655
Hess North Dakota Pipelines Operations Limited Partnership
Description Of Business [Line Items]
Percentage of noncontrolling economic interest		80.00%
Hess T G P Operations Limited Partnership
Description Of Business [Line Items]
Natural gas processing capacity expansion \| MMcf					150
Percentage of noncontrolling economic interest		80.00%
Hess North Dakota Export Logistics Operations Limited Partnership
Description Of Business [Line Items]
Percentage of noncontrolling economic interest		80.00%
Third-party Residue Export Expansion
Description Of Business [Line Items]
Expected natural gas processing capacity \| MMcf				400
Hess Water Services Holdings Limited Liability Company
Description Of Business [Line Items]
Percentage of ownership interest	100.00%	100.00%
Hess Midstream Partners GP Limited Partner
Description Of Business [Line Items]
Percentage of ownership interest		100.00%
Hess Infrastructure Partners LP \| Common Units
Description Of Business [Line Items]
Common and subordinated units issued			10,282,654
Hess Infrastructure Partners LP \| Subordinated Units
Description Of Business [Line Items]
Common and subordinated units issued			27,279,654
Hess Infrastructure Partners LP \| IPO
Description Of Business [Line Items]
Percentage of ownership interest			20.00%
Hess Mentor Storage Holdings Limited Liability Company \| IPO
Description Of Business [Line Items]
Percentage of ownership interest			100.00%
Hess Infrastructure Partners Limited Partnership Joint Interest Assets
Description Of Business [Line Items]
Percentage of ownership interest	80.00%
Hess Water Services and Hess Midstream Partners GP Limited Partner
Description Of Business [Line Items]
Percentage of ownership interest	100.00%
Public Limited Partners
Description Of Business [Line Items]
Percentage of ownership interest				97.30%	95.00%
Percentage of indirect ownership interest				12.90%	6.00%
Percentage of voting interest				12.90%	6.00%
Hess and GIP
Description Of Business [Line Items]
Percentage of noncontrolling economic interest				86.70%	93.70%
Percentage of ownership interest				2.70%	5.00%
Percentage of indirect ownership interest	100.00%
Percentage of direct ownership interest				87.10%	94.00%
Cash consideration \| $	$ 601.8
Percentage of voting interest				87.10%	94.00%
Stock exchange ratio	100.00%
Hess and GIP \| Common Class A
Description Of Business [Line Items]
Conversion of Class B units and Class B shares into Class A shares	100.00%
Number of units hold in partnership	898,000

Summary of Significant Accounting Policies and Basis of Presentation - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 16, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Line Items]
Noncontrolling interest percentage		86.70%	93.70%
Doubtful accounts written off		$ 0	$ 0
Allowance for doubtful accounts		0	0
Impairment of long-lived assets		$ 0	0	$ 0
Minimum
Accounting Policies [Line Items]
Depreciation lives of assets		12 years
Maximum
Accounting Policies [Line Items]
Depreciation lives of assets		35 years
Other Noncurrent Liabilities
Accounting Policies [Line Items]
Asset retirement obligation, noncurrent		$ 11,000,000.0	12,800,000
Accrued Liabilities
Accounting Policies [Line Items]
Asset retirement obligation,current		3,000,000.0	1,700,000
Revolving Credit Facility \| Other Noncurrent Assets
Accounting Policies [Line Items]
Unamortized deferred financing costs and discounts		6,900,000	9,300,000
Fixed-Rate Senior Notes and Term Loan \| Long-term Debt
Accounting Policies [Line Items]
Unamortized deferred financing costs and discounts		$ 30,500,000	$ 23,900,000
LM4
Accounting Policies [Line Items]
Capitalized interests expenses				$ 4,100,000
Hess Infrastructure Partners Limited Partnership Joint Interest Assets
Accounting Policies [Line Items]
Noncontrolling interest percentage prior to restructuring		80.00%
Percentage of ownership interest	80.00%
General Partner Interest and IDRs
Accounting Policies [Line Items]
Percentage of ownership interest		2.00%

Equity Transactions - Additional Information (Details) - USD ($)				12 Months Ended
	Oct. 08, 2021	Jul. 27, 2021	Mar. 15, 2021	Dec. 31, 2021	Dec. 31, 2020	Aug. 10, 2021
Class of Stock [Line Items]
Percentage of ownership interest				13.30%	6.30%
Additions to deferred tax asset				$ 117,300,000	$ 42,800,000	$ 89,000,000.0
Costs incurred to repurchase shares were charged to equity				2,100,000
4.250% Senior Notes Due 2030
Class of Stock [Line Items]
Fixed-rate senior notes						$ 750,000,000.0
Class A Shares
Class of Stock [Line Items]
Equity offering transaction	8,625,000		6,900,000
Shares issued, price per share	$ 26.00		$ 21.00
Proceeds from Issuance of public equity offering				0
Net proceeds received by sponsors from public equity offering				356,500,000
Common unitholders	$ 52,400,000			204,100,000	$ 125,000,000.0
Additions to deferred tax asset	$ 74,200,000			$ 14,800,000
Class A Shares \| Maximum
Class of Stock [Line Items]
Underwriters’ option to purchase additional shares			900,000
Underwriters' option to purchase additional shares fully exercised	1,125,000
Class B Shares
Class of Stock [Line Items]
Repurchase of shares		15,625,000
Value of shares repurchased		$ 750,000,000.0
Stock purchased price per share		$ 24.00
Percentage of discount on purchase price per share		4.00%

Acquisitions - Additional Information (Details) - USD ($) $ in Millions					12 Months Ended
	Dec. 16, 2019	Oct. 03, 2019	Mar. 22, 2019	Mar. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Business Acquisition [Line Items]
Cash paid for business acquisition, net of cash acquired						$ 89.2
Restructuring costs						26.2
Hess Infrastructure Partners Limited Partnership Joint Interest Assets
Business Acquisition [Line Items]
Percentage of ownership interest	80.00%
Hess Water Services Holdings Limited Liability Company
Business Acquisition [Line Items]
Percentage of ownership interest	100.00%	100.00%
Hess Infrastructure Partners LP
Business Acquisition [Line Items]
Percentage of membership interest acquired				100.00%
Cash paid for business acquisition, net of cash acquired				$ 225.0
Hess
Business Acquisition [Line Items]
Business combination consideration transferred in excess of book value of net assets acquired as capital distribution						156.1
Hess \| Final Purchase Settlement
Business Acquisition [Line Items]
Business combination consideration transferred in excess of book value of net assets acquired as capital distribution					$ 1.6
Tioga System Acquisition
Business Acquisition [Line Items]
Percentage of membership interest acquired			100.00%
Cash paid for business acquisition, net of cash acquired			$ 89.2
Tioga System Acquisition \| Other Noncurrent Liabilities
Business Acquisition [Line Items]
Contingent liability					$ 7.0		$ 2.9
Hess Infrastructure Partners LP Acquisition
Business Acquisition [Line Items]
Cash consideration	$ 601.8
Stock split conversion ratio	1
Hess Infrastructure Partners LP Acquisition \| General and Administrative Expenses
Business Acquisition [Line Items]
Restructuring costs						$ 26.2
Hess Infrastructure Partners LP Acquisition \| Class A Shares
Business Acquisition [Line Items]
Units representing noncontrolling limited partner interests	898,000
Hess Infrastructure Partners LP Acquisition \| Class B Shares
Business Acquisition [Line Items]
Units representing noncontrolling limited partner interests	266,416,928
Cash consideration	$ 601.8

Acquisitions - Summary of Hess Water Services Acquisition (Detail) - Hess Infrastructure Partners LP $ in Millions	Mar. 01, 2019 USD ($)
Business Acquisition [Line Items]
Property, plant and equipment, net	$ 70.8
Working capital	(1.2)
Asset retirement obligations	(0.7)
Net assets acquired	$ 68.9

Related Party Transactions - Additional Information (Detail)		12 Months Ended
	Jan. 24, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jan. 25, 2018
LM4
Related Party Transaction [Line Items]
Initial term of agreement	16 years
Agreement description		The agreement has a 16-year initial term, after which it is automatically renewed for subsequent one-year terms unless terminated by either party
Percentage of gas processing plant capacity	50.00%
Percentage of ownership in joint venture	50.00%				50.00%	50.00%
Customer Concentration Risk \| Revenue
Related Party Transaction [Line Items]
Revenues attributable to fee based commercial agreements		100.00%	100.00%
Hess \| Customer Concentration Risk \| Revenue
Related Party Transaction [Line Items]
Revenues attributable to fee based commercial agreements		100.00%	100.00%	100.00%
Hess \| Amended and Restated Commercial Agreement
Related Party Transaction [Line Items]
Minimum volume commitments, Description		MVCs are equal to 80% of Hess' nominations in each development plan that apply on a three-year rolling basis such that MVCs are set for the three years following the most recent nomination. Without our consent, the MVCs resulting from the nominated volumes for any quarter or year contained in any prior development plan cannot be reduced by any updated development plan unless dedicated production is released by us. The applicable MVCs may, however, be increased as a result of the nominations contained in any such updated development plan.
Minimum volume commitments expressed as percentage of related party nominations in development plans		80.00%
Initial term of agreement		10 years
Agreement description		each of our commercial agreements with Hess has an initial 10-year term effective January 1, 2014 (“Initial Term”).
Number of rights to extend the term of agreement		one
Advance period to call for extension of term of agreement		3 years
Secondary term of agreement		10 years
Hess \| Amended and Restated Agreement for Certain Gas Gathering Sub-system
Related Party Transaction [Line Items]
Initial term of agreement		15 years
Agreement description		For this gathering sub-system, the Initial Term is 15 years effective January 1, 2014 and for the water services agreements the Initial Term is 14 years effective January 1, 2019.
Secondary term of agreement		5 years
Hess \| Amended and Restated Water Services Agreements
Related Party Transaction [Line Items]
Initial term of agreement		14 years
Secondary term of agreement		10 years
Hess \| Terminal and Export Services Agreement
Related Party Transaction [Line Items]
Commercial agreement period		20 years
Hess \| Commercial Agreements Other Than Storage Services Agreement and Terminal and Export Services Agreement
Related Party Transaction [Line Items]
Minimum volume commitments, Description		During the Secondary Term of our commercial agreements, Hess will continue to have MVCs equal to 80% of Hess' nominations in each development plan that apply on a three-year rolling basis through the Secondary Term.
Minimum volume commitments expressed as percentage of related party nominations in development plans		80.00%
Maximum consumer price index percentage		3.00%
Fee recalculation model description		the fee recalculation model under each applicable agreement will be replaced by an inflation-based fee structure. The initial fee for the first year of the Secondary Term will be determined based on the average fees paid by Hess under the applicable agreement during the last three years of the Initial Term (with such fees adjusted for inflation through the first year of the Secondary Term). For each year following the first year of the Secondary Term, the applicable fee will be adjusted annually based on the percentage change in the consumer price index, provided that we may not increase any fee by more than 3% in any calendar year solely by reason of an increase in the consumer price index, and no fee will ever be reduced below the amount of the applicable fee payable by Hess in the prior year as a result of a decrease in the consumer price index. During the Secondary Term of our commercial agreements, Hess will continue to have MVCs equal to 80% of Hess' nominations in each development plan that apply on a three-year rolling basis through the Secondary Term.
Targa Resources Corp. \| LM4
Related Party Transaction [Line Items]
Percentage of ownership in joint venture	50.00%					50.00%

Related Party Transactions - Summary of Revenues From Contracts With Customers on Disaggregated Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 1,203.8	$ 1,091.6	$ 847.6
Other income		0.3	0.7
Total revenues	1,203.8	1,091.9	848.3
Oil and Gas Gathering Services
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	540.4	469.3	345.6
Processing and Storage Services
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	435.7	370.3	294.7
Terminaling and Export Services
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	137.5	159.4	130.0
Water Gathering and Disposal Services
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 90.2	$ 92.6	$ 77.3

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Related Party Transactions - Summary of MVC Shortfall Fees Earned (Details) - Hess - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Total MVC shortfall fees	$ 87.0	$ 18.7	$ 8.3
Oil and Gas Gathering Services
Related Party Transaction [Line Items]
Total MVC shortfall fees	43.0	12.5	5.0
Terminaling and Export Services
Related Party Transaction [Line Items]
Total MVC shortfall fees	32.8	4.8	2.2
Water Gathering and Disposal Services
Related Party Transaction [Line Items]
Total MVC shortfall fees	6.8	$ 1.4	$ 1.1
Processing and Storage Services
Related Party Transaction [Line Items]
Total MVC shortfall fees	$ 4.4

Related Party Transactions - Summary of Third-party Pass-through Costs for Which Revenues in Amount Equal to Costs are Recognized (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Reimbursement revenue	$ 1,203.8	$ 1,091.6	$ 847.6
Hess
Related Party Transaction [Line Items]
Total	87.4	146.6	130.1
Hess \| Electricity and Other Related Fees
Related Party Transaction [Line Items]
Reimbursement revenue	50.3	40.0	32.2
Hess \| Produced Water Trucking and Disposal Costs
Related Party Transaction [Line Items]
Reimbursement revenue	37.0	55.9	57.7
Hess \| Rail Transportation Costs
Related Party Transaction [Line Items]
Reimbursement revenue	$ 0.1	$ 50.7	$ 40.2

Distribution Made To Limited Partner [Line Items]

Related Party Transactions - Summary of Classification of Charges between Operating and Maintenance Expenses and General and Administrative Expenses (Detail) - Hess - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Operating and maintenance expenses	$ 63.6	$ 62.8	$ 53.1
General and administrative expenses	15.4	15.1	15.5
Total	$ 79.0	$ 77.9	$ 68.6

Related Party Transactions - Summary of Activity Related to Agreements with Related Party (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Earnings from equity investments	$ 10.6	$ 10.3	$ 3.4
Distributions received from equity investments	17.4	9.7
LM4
Related Party Transaction [Line Items]
Processing fee incurred	27.7	25.6	6.3
Earnings from equity investments	10.6	10.3	$ 3.4
Distributions received from equity investments	$ 17.4	$ 9.7

Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 4,341.4	$ 4,162.7
Accumulated depreciation	(1,216.4)	(1,051.4)
Property, plant and equipment, net	$ 3,125.0	3,111.3
Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	12 years
Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	35 years
Logistics Facilities and Railcars
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 386.5	386.2
Logistics Facilities and Railcars \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	20 years
Logistics Facilities and Railcars \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	25 years
Storage Facilities
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 19.5	19.5
Storage Facilities \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	20 years
Storage Facilities \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	25 years
Other
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 25.8	20.9
Other \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	20 years
Other \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	25 years
Construction-In-Progress
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 131.6	227.3
Gathering Assets \| Pipelines
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	22 years
Total property, plant and equipment, at cost	$ 1,489.7	1,470.6
Gathering Assets \| Compressors, Pumping Stations and Terminals
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 809.0	778.6
Gathering Assets \| Compressors, Pumping Stations and Terminals \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	22 years
Gathering Assets \| Compressors, Pumping Stations and Terminals \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	25 years
Gas Plant Assets \| Pipelines, Pipes and Valves
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 460.0	460.0
Gas Plant Assets \| Pipelines, Pipes and Valves \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	22 years
Gas Plant Assets \| Pipelines, Pipes and Valves \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	25 years
Gas Plant Assets \| Equipment
Property Plant And Equipment [Line Items]
Total property, plant and equipment, at cost	$ 428.3	428.3
Gas Plant Assets \| Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	12 years
Gas Plant Assets \| Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	30 years
Gas Plant Assets \| Processing and Fractionation Facilities
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	25 years
Total property, plant and equipment, at cost	$ 408.7	189.0
Gas Plant Assets \| Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful life	35 years
Total property, plant and equipment, at cost	$ 182.3	$ 182.3

Accrued Liabilities and Other Current Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities Current [Abstract]
Accrued interest	$ 30.9	$ 18.0
Accrued capital expenditures	26.5	13.6
Other accruals	18.8	22.5
Total	$ 76.2	$ 54.1

Accrued Liabilities and Other Current Liabilities - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities Current [Abstract]
Other current liabilities	$ 10.2	$ 9.9

Debt and Interest Expense - Summary of Total Long-term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total Borrowings	$ 2,594.0	$ 1,934.0
Unamortized deferred financing costs and discounts	(30.5)	(23.9)
Total debt	2,563.5	1,910.1
Less: current maturities of long-term debt	20.0	10.0
Total long-term debt	2,543.5	1,900.1
Term Loan A Facility
Debt Instrument [Line Items]
Total Borrowings	390.0	400.0
Revolving Credit Facility
Debt Instrument [Line Items]
Total Borrowings	104.0	184.0
Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Total Borrowings	2,100.0	1,350.0
Fixed-Rate Senior Notes \| 5.625% Fixed Rate Senior Notes due 2026
Debt Instrument [Line Items]
Total Borrowings	800.0	800.0
Fixed-Rate Senior Notes \| 5.125% Fixed Rate Senior Notes due 2028
Debt Instrument [Line Items]
Total Borrowings	550.0	$ 550.0
Fixed-Rate Senior Notes \| 4.250% Fixed Rate Senior Notes due 2030
Debt Instrument [Line Items]
Total Borrowings	$ 750.0

Debt and Interest Expense - Summary of Total Long-term Debt (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2021
5.625% Fixed Rate Senior Notes due 2026
Debt Instrument [Line Items]
Debt instrument interest rate	5.625%
Debt instrument due year	2026
5.125% Fixed Rate Senior Notes due 2028
Debt Instrument [Line Items]
Debt instrument interest rate	5.125%
Debt instrument due year	2028
4.250% Fixed Rate Senior Notes due 2030
Debt Instrument [Line Items]
Debt instrument interest rate	4.25%
Debt instrument due year	2030

Debt and Interest Expense - Summary of Maturity Profile of Total Debt, Excluding Deferred Financing Costs and Discounts (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt (excluding interest)	$ 2,594.0	$ 1,934.0
2022	20.0
2023	30.0
2024	444.0
2026	800.0
2027 and thereafter	1,300.0
Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Total debt (excluding interest)	2,100.0	1,350.0
2026	800.0
2027 and thereafter	1,300.0
Term Loan Facility
Debt Instrument [Line Items]
Total debt (excluding interest)	390.0
2022	20.0
2023	30.0
2024	340.0
Revolving Credit Facility
Debt Instrument [Line Items]
Total debt (excluding interest)	104.0	$ 184.0
2024	$ 104.0

Debt and Interest Expense - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2021
Debt Instrument [Line Items]
Debt covenant, leverage ratio		550.00%
Ratio of debt to EBITDA		500.00%
Secured leverage ratio - Maximum		400.00%
Debt instrument covenant, description		The Credit Facilities contain representations and warranties, affirmative and negative covenants and events of default that the Partnership considers to be customary for an agreement of this type, including a covenant that requires the Partnership to maintain a ratio of total debt to EBITDA (as defined in the Credit Facilities) for the prior four fiscal quarters of not greater than 5.00 to 1.00 as of the last day of each fiscal quarter (5.50 to 1.00 during the specified period following certain acquisitions) and, prior to the Partnership obtaining an investment grade credit rating, a ratio of secured debt to EBITDA for the prior four fiscal quarters of not greater than 4.00 to 1.00 as of the last day of each fiscal quarter.
Total debt		$ 2,563,500,000	$ 1,910,100,000
Line of credit interest paid on credit facilities, including facility fees			$ 88,900,000	$ 60,800,000
Carrying Value
Debt Instrument [Line Items]
Total debt		2,563,500,000
Level 2
Debt Instrument [Line Items]
Total debt fair value		$ 2,648,500,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility - Term		5 years
Maximum borrowing capacity		$ 1,000,000,000.0
Borrowings		$ 104,000,000.0
Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate applicable margin		1.55%
Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate applicable margin		2.50%
Term Loan A Facility
Debt Instrument [Line Items]
Credit facility - Term		5 years
Maximum borrowing capacity		$ 400,000,000.0
Cash received		210,000,000.0
Borrowings		$ 390,000,000.0
Syndicated Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility - Term		5 years
Syndicated Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate applicable margin		1.275%
Syndicated Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate applicable margin		2.00%
Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Debt covenant, leverage ratio		425.00%
5.625% Fixed Rate Senior Notes due 2026
Debt Instrument [Line Items]
Aggregate principal amount of fixed-rate senior notes	$ 800,000,000.0			800,000,000.0
Debt instrument interest rate		5.625%
Debt instrument due year		2026
5.625% Fixed Rate Senior Notes due 2026 \| Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate		5.625%
Debt instrument due year		2026
Exchange consent fee	2,000,000.0
Frequency of periodic interest payment		semi‑annually
Interest payment terms		Interest is payable semi‑annually on February 15 and August 15.
5.125% Fixed Rate Senior Notes due 2028
Debt Instrument [Line Items]
Aggregate principal amount of fixed-rate senior notes	$ 550,000,000.0			$ 550,000,000.0
Debt instrument interest rate		5.125%
Debt instrument due year		2028
5.125% Fixed Rate Senior Notes due 2028 \| Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate		5.125%
Debt instrument due year		2028
Frequency of periodic interest payment		semi‑annually
Interest payment terms		Interest is payable semi‑annually on June 15 and December 15.
4.250% Fixed Rate Senior Notes due 2030
Debt Instrument [Line Items]
Aggregate principal amount of fixed-rate senior notes					$ 750,000,000.0
Debt instrument interest rate		4.25%
Debt instrument due year		2030
4.250% Fixed Rate Senior Notes due 2030 \| Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate		4.25%
Debt instrument due year		2030
Frequency of periodic interest payment		semi‑annually
Interest payment terms		Interest is payable semi‑annually on February 15 and August 15

Partners' Capital and Distributions - Additional Information (Detail) $ / shares in Units, $ in Millions		12 Months Ended
	Dec. 16, 2019 USD ($) $ / shares shares	Dec. 31, 2021
Distribution Made To Limited Partner [Line Items]
Period of cash distribution to shareholders		45 days
Hess Infrastructure Partners LP Acquisition
Distribution Made To Limited Partner [Line Items]
Cash consideration \| $	$ 601.8
Stock split conversion ratio	1
Common units of the partnership converted into class A shares	17,062,655
Hess Infrastructure Partners LP Acquisition \| Common Class A
Distribution Made To Limited Partner [Line Items]
Units representing noncontrolling limited partner interests	898,000
Hess Infrastructure Partners LP Acquisition \| Class B Shares
Distribution Made To Limited Partner [Line Items]
Units representing noncontrolling limited partner interests	266,416,928
Cash consideration \| $	$ 601.8
Business acquisition, share price \| $ / shares	$ 0.0001

Partners' Capital and Distributions - Schedule of Changes in Number of Shares Outstanding (Details) - shares			12 Months Ended
	Oct. 08, 2021	Mar. 15, 2021	Dec. 31, 2021	Dec. 31, 2020
Limited Partners Capital Account [Line Items]
Shares Outstanding, Beginning Balance			284,445,236	284,377,583
Equity-based compensation			118,760	67,653
Repurchase Transaction			(31,250,000)
Shares Outstanding, Ending Balance			253,313,996	284,445,236
Class A Shares
Limited Partners Capital Account [Line Items]
Shares Outstanding, Beginning Balance			18,028,308	17,960,655
Equity-based compensation			118,760	67,653
Equity offering transaction	8,625,000	6,900,000
Shares Outstanding, Ending Balance			33,672,068	18,028,308
Class A Shares \| March 2021
Limited Partners Capital Account [Line Items]
Equity offering transaction			6,900,000
Class A Shares \| October 2021
Limited Partners Capital Account [Line Items]
Equity offering transaction			8,625,000
Class B Shares
Limited Partners Capital Account [Line Items]
Shares Outstanding, Beginning Balance			266,416,928	266,416,928
Repurchase Transaction			(31,250,000)
Shares Outstanding, Ending Balance			219,641,928	266,416,928
Class B Shares \| March 2021
Limited Partners Capital Account [Line Items]
Equity offering transaction			(6,900,000)
Class B Shares \| October 2021
Limited Partners Capital Account [Line Items]
Equity offering transaction			(8,625,000)
Public
Limited Partners Capital Account [Line Items]
Shares Outstanding, Beginning Balance			17,130,308	17,062,655
Equity-based compensation			118,760	67,653
Shares Outstanding, Ending Balance			32,774,068	17,130,308
Public \| March 2021
Limited Partners Capital Account [Line Items]
Equity offering transaction			6,900,000
Public \| October 2021
Limited Partners Capital Account [Line Items]
Equity offering transaction			8,625,000
Sponsors
Limited Partners Capital Account [Line Items]
Shares Outstanding, Beginning Balance			898,000	898,000
Shares Outstanding, Ending Balance			898,000	898,000

Partners' Capital and Distributions - Schedule of Distributions Declared and Paid (Detail)

12 Months Ended

Dec. 31, 2021

$ / shares

First Quarter 2019

May 03, 2019

May 14, 2019

Distribution Made To Limited Partner [Line Items]

$ 0.3833

Second Quarter 2019

Aug. 05, 2019

Aug. 13, 2019

Distribution Made To Limited Partner [Line Items]

$ 0.3970

Third Quarter 2019

Nov. 04, 2019

Nov. 13, 2019

Distribution Made To Limited Partner [Line Items]

$ 0.4112

Fourth Quarter 2019

Feb. 06, 2020

Feb. 14, 2020

Distribution Made To Limited Partner [Line Items]

$ 0.4258

First Quarter 2020

May 04, 2020

May 14, 2020

Distribution Made To Limited Partner [Line Items]

$ 0.4310

Second Quarter 2020

Aug. 06, 2020

Aug. 14, 2020

Distribution Made To Limited Partner [Line Items]

$ 0.4363

Third Quarter 2020

Nov. 05, 2020

Nov. 13, 2020

Distribution Made To Limited Partner [Line Items]

$ 0.4417

Fourth Quarter 2020

Feb. 04, 2021

Feb. 12, 2021

Distribution Made To Limited Partner [Line Items]

$ 0.4471

First Quarter 2021

May 03, 2021

May 13, 2021

Distribution Made To Limited Partner [Line Items]

$ 0.4526

Second Quarter 2021

Aug. 09, 2021

Aug. 13, 2021

Distribution Made To Limited Partner [Line Items]

$ 0.5042

Third Quarter 2021

Nov. 04, 2021

Nov. 12, 2021

Distribution Made To Limited Partner [Line Items]

$ 0.5104

Fourth Quarter 2021

Feb. 03, 2022

^[1]

Feb. 14, 2022

^[1]

Diluted net income per share [Line Items]

$ 0.5167

^[1]

[1]	For more information, see Note 16, Subsequent Events.

Equity-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense	$ 1.4	$ 1.5	$ 1.5
2017 Long-Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost related to restricted shares to be recognized	$ 1.8
Cost related to unvested restricted shares to be recognized, over an expected weighted-average period	1 year 9 months 18 days
2017 Long-Term Incentive Plan \| Officers and Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Phantom units vesting period	3 years
2017 Long-Term Incentive Plan \| Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Phantom units vesting period	1 year
Common Class A \| 2017 Long-Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares pursuant to vested awards	3,000,000

Equity-Based Compensation - Schedule of Equity-based Award Activity (Detail) - Restricted Share - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding and unvested shares at December 31, 2020, Number of Shares	228,344
Granted, Number of Shares	78,347
Vested, Number of Shares	(118,760)
Outstanding and unvested shares at December 31, 2021, Number of Shares	187,931	228,344
Outstanding and unvested shares at December 31, 2020, Weighted Average Award Date Fair Value	$ 13.78
Granted, Weighted Average Award Date Fair Value	22.40
Vested, Weighted Average Award Date Fair Value	14.77
Outstanding and unvested shares at December 31, 2021, Weighted Average Award Date Fair Value	$ 16.75	$ 13.78
Fair value of shares granted	$ 1.8	$ 1.9	$ 1.7
Fair value of shares vested	$ 1.8	$ 1.5	$ 1.0

Earnings per Share/Limited Partner Unit - Additional Information (Detail) - shares		12 Months Ended
	Dec. 16, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Dilutive Restricted Shares
Limited Partners Capital Account [Line Items]
Weighted average number shares		103,672	88,013
Dilutive Restricted Units
Limited Partners Capital Account [Line Items]
Weighted average number shares				135,712
Hess and GIP \| Class A Shares
Limited Partners Capital Account [Line Items]
Conversion of Class B units and Class B shares into Class A shares	100.00%

Earnings per Share/Limited Partner Unit - Partnership's Calculation of Earnings per Share Limited Partner Unit (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Net income

$ 617.8

$ 484.9

$ 317.7

Less: Net income (loss) attributable to net parent investment

(55.0)

Less: Net income (loss) attributable to noncontrolling interest

571.4

460.9

302.6

Net income attributable to Hess Midstream LP

46.4

24.0

70.1

Less: General partners' interest in net income prior to the Restructuring

3.4

Limited partners' interest in net income

$ 46.4

$ 24.0

$ 66.7

Common Units

Weighted average limited partner units outstanding prior to the Restructuring, Basic:

Units outstanding prior to the Restructuring, Basic

27.3

Weighted average limited partner units outstanding prior to the Restructuring, Diluted:

Units outstanding prior to the Restructuring, Diluted

27.5

Subordinated Units

Weighted average limited partner units outstanding prior to the Restructuring, Basic:

Units outstanding prior to the Restructuring, Basic

27.3

Weighted average limited partner units outstanding prior to the Restructuring, Diluted:

Units outstanding prior to the Restructuring, Diluted

27.3

Class A Shares

Net income attributable to Hess Midstream LP per Class A share:

Net income attributable to Hess Midstream LP per Class A share, Basic

^[1]

$ 1.81

$ 1.33

$ 1.21

Net income attributable to Hess Midstream LP per Class A share, Diluted

^[1]

$ 1.76

$ 1.31

$ 1.20

Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):

Weighted average Class A shares outstanding, Basic

25.6

18.0

Weighted average Class A shares outstanding, Diluted

25.7

18.1

18.0

[1]

Earnings per Share/Limited Partner Unit - Summary of Reconciliation of Numerator and Denominator of Diluted Earnings (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Numerator

Net income attributable to Hess Midstream LP

$ 46.4

$ 24.0

$ 70.1

Effect of Exchange of Units of Partnership and Equal Number Shares of Common Stocks

571.4

Effect of income tax expense on additional income attributable to Hess Midstream LP

^[1]

(139.4)

Diluted net income attributable to Hess Midstream LP

$ 478.4

Class A Shares

Denominator

Basic weighted average shares outstanding

25.6

18.0

Effect of dilutive securities

Diluted weighted average shares outstanding

25.7

18.1

18.0

Diluted net income attributable to Hess Midstream LP per Class A Share

$ 1.76

Class B Units/Shares

Denominator

Basic weighted average shares outstanding

246.7

Effect of dilutive securities

Diluted weighted average shares outstanding

272.4

Restricted equity-based awards

0.1

[1]	(1) Income tax effect is calculated assuming 24.39% blended U.S. federal and state income tax rate.

Earnings per Share/Limited Partner Unit - Summary of Reconciliation of Numerator and Denominator of Diluted Earnings (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Federal and state income tax rate	24.39%

Concentration of Credit Risk - Additional Information (Detail) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%
Revenue
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%

Commitments and Contingencies - Additional Information (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Estimated remediation liabilities included in accrued liabilities	$ 800,000	$ 900,000
Estimated remediation liabilities included in other noncurrent liabilities	3,100,000	3,100,000
Accrued liabilities for legal contingencies	0	0
Lease obligations	0	$ 0
Unconditional purchase obligation, due in next fiscal year	11,900,000
Unconditional purchase obligation, due thereafter	$ 0

Segments - Additional Information (Detail)	12 Months Ended
Segments - Additional Information (Detail)	Dec. 31, 2021 mi Railcar Segment	Sep. 30, 2019	Jan. 25, 2018	Jan. 24, 2018
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	3
Number of crude oil rail cars	550
McKenzie County
Segment Reporting Information [Line Items]
Crude oil pipeline length \| mi	6
Minimum
Segment Reporting Information [Line Items]
Number of crude oil rail cars, operate as unit trains	100
Maximum
Segment Reporting Information [Line Items]
Number of crude oil rail cars, operate as unit trains	110
LM4
Segment Reporting Information [Line Items]
Percentage of ownership in joint venture		50.00%	50.00%	50.00%

Segments - Financial Data for Each Reportable Segment (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

$ 1,203.8

$ 1,091.9

$ 848.3

Net income (loss) attributable to Hess Midstream LP

617.8

484.9

317.7

46.4

24.0

70.1

Proportional share of equity affiliates' depreciation

165.6

156.9

142.5

5.1

2.0

Income from equity investments

10.6

10.3

3.4

Interest expense, net

105.4

94.7

62.4

Income tax expense (benefit)

14.6

7.3

(0.1)

Transaction costs

26.2

Gain on sale of property, plant and equipment

0.1

908.5

748.8

550.7

^[1]

183.0

253.0

416.3

Interest and Other

Net income (loss) attributable to Hess Midstream LP

(127.3)

(108.0)

(99.2)

(25.5)

(13.6)

(9.6)

Interest expense, net

105.4

94.7

62.4

Income tax expense (benefit)

14.6

7.3

(0.1)

Transaction costs

26.2

Gathering Opco | Operating Segments

(7.3)

(6.0)

(10.7)

630.6

561.9

422.9

Net income (loss) attributable to Hess Midstream LP

377.6

300.7

186.0

36.3

19.2

34.6

Gain on sale of property, plant and equipment

101.0

96.0

81.6

0.1

478.6

396.6

267.6

Processing and Storage | Operating Segments

^[1]

154.0

96.2

373.6

435.7

370.6

295.3

Net income (loss) attributable to Hess Midstream LP

263.8

218.7

176.1

25.5

13.7

34.6

Proportional share of equity affiliates' depreciation

48.4

44.8

44.7

5.1

2.0

Income from equity investments

10.6

10.3

3.4

317.3

268.6

222.8

Terminaling and Export | Operating Segments

^[1]

28.8

156.2

42.5

137.5

159.4

130.1

Net income (loss) attributable to Hess Midstream LP

103.7

73.5

54.8

10.1

4.7

10.5

16.2

16.1

16.2

119.9

89.6

71.0

^[1]

$ 0.2

$ 0.6

$ 0.2

[1]	Includes acquisition, expansion, and maintenance capital expenditures.

Segments - Total Assets for Reportable Segments (Detail) - USD ($)
$ in Millions

Dec. 31, 2021

Dec. 31, 2020

$ 3,485.6

$ 3,374.5

Interest and Other

Gathering Opco | Operating Segments

127.7

55.7

Processing and Storage | Operating Segments

1,927.0

1,856.2

Terminaling and Export | Operating Segments

^[1]

1,149.5

1,170.3

$ 281.4

$ 292.3

[1]	Includes investment in equity investees of $101.6 million as of December 31, 2021 and $108.4 million as of December 31, 2020.

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Segments - Total Assets for Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Cash contributed to acquire equity investments			$ 33.0
Processing and Storage
Segment Reporting Information [Line Items]
Cash contributed to acquire equity investments	$ 101.6	$ 108.4

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Aug. 10, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Deferred tax asset related to investments	$ 102,300,000		$ 39,000,000.0	$ 49,800,000
Additions to deferred tax asset	117,300,000	$ 89,000,000.0	$ 42,800,000
Deferred tax asset related to U.S. federal net operating loss carryforwards	12,400,000
Deferred tax asset related to U.S. state net operating loss carryforwards	$ 2,600,000
Operating loss carryforward expiration year	2040
Unrecognized tax benefits	$ 0

Income Taxes - Schedule of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal
Current	$ 0.1
Deferred taxes and other accruals	12.5	$ 6.2	$ (0.1)
State	2.0	1.1
Total provision (benefit) for income taxes	$ 14.6	$ 7.3	$ (0.1)