CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 617.8	$ 484.9	$ 317.7
Effect of hedge (gains) losses reclassified to income		(0.4)	(0.8)
Total other comprehensive income		(0.4)	(0.8)
Comprehensive income	617.8	484.5	316.9
Less: Comprehensive income (loss) attributable to net parent investment			(55.6)
Less: Comprehensive income (loss) attributable to noncontrolling interest	571.4	460.5	302.6
Comprehensive income attributable to Hess Midstream LP	$ 46.4	$ 24.0	$ 69.9