CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues
Affiliate services	$ 313.0	$ 294.8	$ 625.1	$ 583.6
Type of Revenue [Extensible List]	us-gaap:ServiceMember	us-gaap:ServiceMember	us-gaap:ServiceMember	us-gaap:ServiceMember
Other income	$ 0.4		$ 0.7
Total revenues	313.4	$ 294.8	625.8	$ 583.6
Costs and expenses
Operating and maintenance expenses (exclusive of depreciation shown separately below)	67.8	63.6	134.3	123.4
Depreciation expense	45.0	40.4	89.4	80.6
General and administrative expenses	5.3	5.2	11.3	11.5
Total costs and expenses	118.1	109.2	235.0	215.5
Income from operations	195.3	185.6	390.8	368.1
Income from equity investments	1.0	2.9	1.4	5.6
Interest expense, net	37.4	22.9	68.7	46.0
Income before income tax expense	158.9	165.6	323.5	327.7
Income tax expense	7.1	3.6	12.1	6.1
Net income	151.8	162.0	311.4	321.6
Less: Net income attributable to noncontrolling interest	129.8	151.0	272.5	302.0
Net income attributable to Hess Midstream LP	$ 22.0	$ 11.0	$ 38.9	$ 19.6
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	$ 0.51	$ 0.44	$ 1.01	$ 0.89
Net income attributable to Hess Midstream LP per Class A share, Diluted	$ 0.50	$ 0.44	$ 0.99	$ 0.87
Weighted average Class A shares outstanding
Weighted average Class A shares outstanding subsequent to the restructuring, Basic	43.7	25.0	38.7	22.2
Weighted average Class A shares outstanding subsequent to the restructuring, Diluted	43.7	25.1	38.8	22.3