Earnings per Share - Summary of Reconciliation of Numerator and Denominator of Diluted Earnings (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator
Net income (loss) attributable to Hess Midstream LP		$ 223.1	$ 118.6	$ 83.9
Effect of Exchange of Units of Partnership and Equal Number Shares of Common Stocks		435.9	489.1	536.7
Effect of income tax expense on additional income attributable to Hess Midstream LP	[1]	(106.3)	(119.3)	(130.9)
Diluted net income attributable to Hess Midstream LP		$ 552.7	$ 488.4	$ 489.7
Class A Shares
Denominator
Basic weighted average shares outstanding		89	56.2	41.3
Effect of dilutive securities
Diluted weighted average shares outstanding		89	56.3	41.4
Diluted net income attributable to Hess Midstream LP per Class A Share		$ 2.49	$ 2.08	$ 2.01
Class B Units/Shares
Denominator
Basic weighted average shares outstanding		132.8	177.9	202
Effect of dilutive securities
Diluted weighted average shares outstanding		221.8	234.2	243.4
Restricted equity-based awards		0	0.1	0.1

[1] Income tax effect is calculated assuming 24.39% blended U.S. federal and state income tax rate.