CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues
Affiliate services	$ 334.2	$ 303.9	$ 959.3	$ 887.5
Type of Revenue [Extensible List]	us-gaap:ServiceMember	us-gaap:ServiceMember	us-gaap:ServiceMember	us-gaap:ServiceMember
Other income	$ 0.6		$ 1.3
Total revenues	334.8	$ 303.9	960.6	$ 887.5
Costs and expenses
Operating and maintenance expenses (exclusive of depreciation shown separately below)	79.6	98.1	213.9	221.5
Depreciation expense	45.5	41.5	134.9	122.1
General and administrative expenses	5.7	5.1	17.0	16.6
Total costs and expenses	130.8	144.7	365.8	360.2
Income from operations	204.0	159.2	594.8	527.3
Income from equity investments	2.8	3.0	4.2	8.6
Interest expense, net	39.9	28.0	108.6	74.0
Income before income tax expense	166.9	134.2	490.4	461.9
Income tax expense	7.5	3.1	19.6	9.2
Net income	159.4	131.1	470.8	452.7
Less: Net income attributable to noncontrolling interest	136.2	121.2	408.7	423.2
Net income attributable to Hess Midstream LP	$ 23.2	$ 9.9	$ 62.1	$ 29.5
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	$ 0.53	$ 0.39	$ 1.54	$ 1.27
Net income attributable to Hess Midstream LP per Class A share, Diluted	$ 0.53	$ 0.38	$ 1.52	$ 1.25
Weighted average Class A shares outstanding
Weighted average Class A shares outstanding subsequent to the restructuring, Basic	44.0	25.0	40.5	23.1
Weighted average Class A shares outstanding subsequent to the restructuring, Diluted	44.1	25.1	40.5	23.2