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, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator
Net income (loss) attributable to Hess Midstream LP		$ 118.6	$ 83.9	$ 46.4
Effect of Exchange of Units of Partnership and Equal Number Shares of Common Stocks		489.1	536.7	571.4
Effect of income tax expense on additional income attributable to Hess Midstream LP	[1]	(119.3)	(130.9)	(139.4)
Diluted net income attributable to Hess Midstream LP		$ 488.4	$ 489.7	$ 478.4
Class A Shares
Denominator
Basic weighted average shares outstanding		56.2	41.3	25.6
Effect of dilutive securities
Diluted weighted average shares outstanding		56.3	41.4	25.7
Diluted net income attributable to Hess Midstream LP per Class A Share		$ 2.08	$ 2.01	$ 1.76
Class B Units/Shares
Denominator
Basic weighted average shares outstanding		177.9	202	246.7
Effect of dilutive securities
Diluted weighted average shares outstanding		234.2	243.4	272.4
Restricted equity-based awards		0.1	0.1	0.1

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