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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, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Limited Partners Capital Account [Line Items] |  |  |  |  |  |
Net income | $ 162.0 | $ 159.6 | $ 107.8 | $ 129.0 | $ 321.6 | $ 236.8
Less: Net income attributable to noncontrolling interest | 151.0 |  | 102.5 |  | 302.0 | 225.0
Net income attributable to Hess Midstream LP | 11.0 |  | 5.3 |  | $ 19.6 | $ 11.8
Class A Shares |  |  |  |  |  |
Limited Partners Capital Account [Line Items] |  |  |  |  |  |
Net income | $ 11.0 | $ 8.6 | $ 5.3 | $ 6.5 |  |
Net income attributable to Hess Midstream LP per Class A share: |  |  |  |  |  |
Net income attributable to Hess Midstream LP per Class A share, Basic | $ 0.44 |  | $ 0.29 |  | $ 0.89 | $ 0.66
Net income attributable to Hess Midstream LP per Class A share, Diluted | $ 0.44 |  | $ 0.29 |  | $ 0.87 | $ 0.64
Weighted average Class A shares outstanding |  |  |  |  |  |
Weighted average Class A shares outstanding, Basic | 25.0 |  | 18.0 |  | 22.2 | 18.0
Weighted average Class A shares outstanding, Diluted | 25.1 |  | 18.1 |  | 22.3 | 18.1

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