CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Total		Prior To Restructuring	After Restructuring	Limited Partners Class A Shares	Limited Partners After Restructuring Class A Shares	Limited Partners Common Unitholders - Public	Limited Partners Common Unitholders - Public Prior To Restructuring	Limited Partners Common Unitholders - Affiliate	Limited Partners Common Unitholders - Affiliate Prior To Restructuring	Limited Partners Subordinated Unitholders - Affiliate	Limited Partners Subordinated Unitholders - Affiliate Prior To Restructuring	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, 2016	$ 1,809.9																		$ 1,809.9
Contribution of net assets to Hess Midstream Partners LP									$ 134.6		$ 357.2		$ 14.6		$ 2,025.2				(2,531.6)
IPO proceeds, net of underwriters' discounts	365.5						$ 365.5
Distributions of IPO proceeds	(349.5)								(95.7)		(253.8)
Offering costs	(10.7)						(10.7)
Net income	242.0	[1]					12.6		7.6		20.2		0.8		175.4				25.4
Other comprehensive income (loss)	1.6	[1]																$ 1.6
Equity-based compensation	0.2						0.2
Distributions to unitholders	(31.7)						(9.9)		(6.0)		(15.8)
Distributions to general partner													(0.6)						0.6
Distributions to noncontrolling interest															(244.6)				244.6
Contributions from noncontrolling interest															78.5				(78.5)
Other contributions (distributions)	(75.0)																		(75.0)
Balance, end of period at Dec. 31, 2017	1,952.3						357.7		40.5		107.8		14.8		2,034.5			1.6	(604.6)
Net income	325.5	[1]					21.6		13.0		34.5		1.7		301.5				(46.8)
Other comprehensive income (loss)	(0.4)	[1]																(0.4)
Equity-based compensation	0.9						0.9
Distributions to unitholders	(74.1)						(23.1)		(14.0)		(37.0)
Distributions to general partner													(1.6)						1.6
Distributions to noncontrolling interest															(199.2)				199.2
Contributions from noncontrolling interest															57.3				(57.3)
Other contributions (distributions)	(328.1)																		(328.1)
Balance, end of period at Dec. 31, 2018	1,876.1	[1]					357.1		39.5		105.3		14.9		2,194.1			1.2	(836.0)
Net income	317.7		$ 325.0	$ (7.3)		$ (0.5)		$ 20.8		$ 12.9		$ 33.5		$ 3.4		$ 309.4	$ (6.8)			$ (55.0)
Other comprehensive income (loss)	(0.8)																	(0.8)
Equity-based compensation			1.3	$ 0.2		$ 0.2		1.3
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)
Balance, end of period at Dec. 31, 2019	$ 1,332.1				$ 131.1										$ 1,200.6			$ 0.4

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