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Earnings per Share - Schedule of Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Limited Partners Capital Account [Line Items]            
Net income $ 179.7 $ 161.4 $ 160.3 $ 161.9 $ 341.1 $ 322.2
Less: Net income attributable to noncontrolling interest 89.4   110.8   179.2 228.1
Net income attributable to Hess Midstream LP $ 90.3   $ 49.5   $ 161.9 $ 94.1
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 $ 0.74   $ 0.59   $ 1.39 $ 1.19
Net income attributable to Hess Midstream LP per Class A share, Diluted $ 0.74   $ 0.59   $ 1.39 $ 1.19
Weighted average Class A shares outstanding            
Weighted average Class A shares outstanding, Basic 121.8   83.8   116.3 79.5
Weighted average Class A shares outstanding, Diluted 121.8   83.8   116.3 79.5