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, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Limited Partners Capital Account [Line Items]
Net income	$ 160.3	$ 161.9	$ 147.9	$ 142.2	$ 322.2	$ 290.1
Less: Net income attributable to noncontrolling interest	110.8		122.8		228.1	244.3
Net income attributable to Hess Midstream LP	$ 49.5		$ 25.1		$ 94.1	$ 45.8
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	$ 0.59		$ 0.5		$ 1.19	$ 0.97
Net income attributable to Hess Midstream LP per Class A share, Diluted	$ 0.59		$ 0.5		$ 1.19	$ 0.97
Weighted average Class A shares outstanding
Weighted average Class A shares outstanding, Basic	83.8		50.1		79.5	47.1
Weighted average Class A shares outstanding, Diluted	83.8		50.2		79.5	47.1