Earnings per Share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Limited Partners Capital Account [Line Items]
Net income	$ 142.2	$ 159.6
Less: Net income attributable to noncontrolling interest	121.5	142.7
Net income attributable to Hess Midstream LP	$ 20.7	$ 16.9
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	$ 0.47	$ 0.50
Net income attributable to Hess Midstream LP per Class A share, Diluted	$ 0.47	$ 0.49
Weighted average Class A shares outstanding
Weighted average Class A shares outstanding, Basic	44.0	33.7
Weighted average Class A shares outstanding, Diluted	44.1	33.8