CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Cash flows from operating activities
Net income		$ 317.7	$ 325.5	[1]	$ 242.0	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense		142.5	126.9	[1]	116.5	[1]
(Gain) loss on sale of property, plant and equipment	[1]		(0.6)		(4.7)
(Gain) loss on interest rate swaps		(0.8)	(0.4)	[1]	(1.7)	[1]
(Income) loss from equity investments		(3.4)
(Increase) decrease in capitalized interest		(4.1)
Amortization of deferred financing costs		5.1	5.0	[1]	3.8	[1]
Equity-based compensation expense		1.5	0.9	[1]	0.2	[1]
Deferred income tax expense (benefit)		(0.1)
Changes in assets and liabilities:
Accounts receivable – affiliate		(19.5)	(6.3)	[1]	(16.9)	[1]
Other current and noncurrent assets		(1.4)	1.9	[1]	1.2	[1]
Accounts payable – trade		11.5	4.0	[1]	(16.7)	[1]
Accounts payable – affiliate		3.7	(6.4)	[1]	7.5	[1]
Accrued liabilities		18.6	17.3	[1]	3.2	[1]
Other current and noncurrent liabilities		(0.6)	(0.9)	[1]	2.1	[1]
Net cash provided by (used in) operating activities		470.7	466.9	[1]	336.5	[1]
Cash flows from investing activities
Acquisitions		(89.2)
Payments for equity investments		(33.0)	(67.3)	[1]
Proceeds from sale of property, plant and equipment	[1]		1.6		12.8
Additions to property, plant and equipment		(306.4)	(241.9)	[1]	(144.2)	[1]
Net cash provided by (used in) investing activities		(497.5)	(307.6)	[1]	(131.4)	[1]
Cash flows from financing activities
Proceeds from (repayments of) bank borrowings - revolver		32.0			(153.0)	[1]
Borrowings		210.0
Repayments		(7.5)	(2.5)	[1]	(385.0)	[1]
Proceeds from issuance of senior notes		550.0			800.0	[1]
Financing costs		(20.4)	(1.0)	[1]	(22.9)	[1]
IPO proceeds, net of underwriters' discounts	[1]				365.5
Distribution of IPO proceeds to Hess and GIP					(349.5)
Cash offering costs	[1]				(2.1)
Distributions to HESM limited partners		(85.4)	(74.1)	[1]	(31.7)	[1]
Cash consideration paid related to Restructuring		(601.8)
Other contributions (distributions)	[1]		(6.1)		27.6
Net cash provided by (used in) financing activities		(79.2)	(405.7)	[1]	148.9	[1]
Increase (decrease) in cash and cash equivalents		(106.0)	(246.4)	[1]	354.0	[1]
Cash and cash equivalents, beginning of period	[1]	109.3	355.7		1.7
Cash and cash equivalents, end of period		3.3	109.3	[1]	355.7	[1]
Supplemental disclosure of non-cash investing and financing activities:
(Increase) decrease in accrued capital expenditures and related liabilities		(10.7)	(29.4)	[1]	25.9	[1]
Recognition of deferred tax asset		49.7
Removal of historical capitalized offering costs	[1]				8.6
Hess and GIP
Cash flows from financing activities
Distribution of IPO proceeds to Hess and GIP	[1]				(349.5)
Distributions to Hess and GIP	[1]		$ (322.0)		$ (100.0)
Hess
Cash flows from investing activities
Acquisitions		(68.9)
Cash flows from financing activities
Capital distribution to Hess associated with acquisitions		$ (156.1)

[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.