CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 159.6	$ 129.0
Other comprehensive income
Effect of hedge (gains) losses reclassified to income		(0.2)
Total other comprehensive income		(0.2)
Comprehensive income	159.6	128.8
Less: Comprehensive income (loss) attributable to noncontrolling interest	151.0	122.3
Comprehensive income attributable to Hess Midstream LP	$ 8.6	$ 6.5