CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (UNAUDITED) - USD ($) $ in Millions	Total		Limited Partner Common Unitholders Public	Limited Partner Common Unitholders Affiliate	Limited Partner Subordinated Unitholders Affiliate	Limited Partner Class A Shares	General Partner	Noncontrolling Interest	Accumulated Other Comprehensive Income	Net Parent Investment
Balance, beginning 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	80.8	[1]	5.3	3.4	8.6		0.8	77.2		(14.5)
Equity-based compensation	0.3	[1]	0.3
Distributions to unitholders	(20.2)	[1]	(6.3)	(3.8)	(10.1)
Distributions to general partner							(0.6)			0.6
Distributions to noncontrolling interest								(57.1)		57.1
Contributions from noncontrolling interest								55.5		(55.5)
Other comprehensive income (loss)	(0.2)	[1]							(0.2)
Acquisition of HessWater Services	(225.0)	[1]								(225.0)
Balance, end of period at Mar. 31, 2019	1,711.8	[1]	$ 356.4	$ 39.1	$ 103.8		$ 15.1	2,269.7	1.0	$ (1,073.3)
Balance, beginning of period at Dec. 31, 2019	1,332.1					$ 131.1		1,200.6	0.4
Net income	129.0					6.5		122.5
Equity-based compensation	0.5					0.5
Distributions to unitholders	(121.0)					(7.6)		(113.4)
Other comprehensive income (loss)	(0.2)								(0.2)
Balance, end of period at Mar. 31, 2020	$ 1,340.4					$ 130.5		$ 1,209.7	$ 0.2

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