v3.26.1
Earnings per Share - Schedule of Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Limited Partners Capital Account [Line Items]    
Net income $ 157.7 $ 161.4
Less: Net income attributable to noncontrolling interest 70.1 89.8
Net income attributable to Hess Midstream LP $ 87.6 $ 71.6
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 $ 0.68 $ 0.65
Net income attributable to Hess Midstream LP per Class A share, Diluted $ 0.68 $ 0.65
Weighted average Class A shares outstanding    
Weighted average Class A shares outstanding, Basic 129.2 110.7
Weighted average Class A shares outstanding, Diluted 129.2 110.8