Earnings per Share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Limited Partners Capital Account [Line Items]
Net income	$ 147.9	$ 142.2	$ 151.8	$ 159.6	$ 290.1	$ 311.4
Less: Net income attributable to noncontrolling interest	122.8		129.8		244.3	272.5
Net income attributable to Hess Midstream LP	$ 25.1		$ 22.0		$ 45.8	$ 38.9
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	$ 0.5		$ 0.51		$ 0.97	$ 1.01
Net income attributable to Hess Midstream LP per Class A share, Diluted	$ 0.5		$ 0.5		$ 0.97	$ 0.99
Weighted average Class A shares outstanding
Weighted average Class A shares outstanding, Basic	50.1		43.7		47.1	38.7
Weighted average Class A shares outstanding, Diluted	50.2		43.7		47.1	38.8