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Earnings per Share/Limited Partner Unit - Partnership's Calculation of Earnings per Share Limited Partner Unit (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | [1] | Mar. 31, 2019 | [1] | Sep. 30, 2020 | Sep. 30, 2019
Limited Partners Capital Account [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 115.8 | $ 107.8 | $ 129.0 | $ 87.4 | [1] | $ 74.4 | $ 80.8 | $ 352.6 | $ 242.6 | [1]
Less: Net income (loss) attributable to net parent investment | [1] |  |  |  | (13.0) |  |  |  |  | (44.0) |
Less: Net income (loss) attributable to noncontrolling interest |  | 110.2 |  |  | 81.3 | [1] |  |  | 335.2 | 232.6 | [1]
Net income attributable to Hess Midstream LP |  | 5.6 |  |  | 19.1 | [1] |  |  | 17.4 | 54.0 | [1]
Less: General partner's interest in net income | [1] |  |  |  | 1.3 |  |  |  |  | 3.1 |
Limited partners' interest in net income |  | $ 5.6 |  |  | 17.8 | [1] |  |  | $ 17.4 | 50.9 | [1]
Common Units |  |  |  |  |  |  |  |  |  |  |
Limited Partners Capital Account [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common unitholders' interest in net income attributable to Hess Midstream LP |  |  |  |  | $ 8.9 |  |  |  |  | $ 25.5 |
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | [1] |  |  |  | $ 0.33 |  |  |  |  | $ 0.93 |
Weighted average limited partner units outstanding prior to the Restructuring, Basic: |  |  |  |  |  |  |  |  |  |  |
Units outstanding prior to the Restructuring, Basic | [1] |  |  |  | 27.3 |  |  |  |  | 27.3 |
Weighted average limited partner units outstanding prior to the Restructuring, Diluted: |  |  |  |  |  |  |  |  |  |  |
Units outstanding prior to the Restructuring, Diluted | [1] |  |  |  | 27.5 |  |  |  |  | 27.5 |
Subordinated Units |  |  |  |  |  |  |  |  |  |  |
Limited Partners Capital Account [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common unitholders' interest in net income attributable to Hess Midstream LP |  |  |  |  | $ 8.9 |  |  |  |  | $ 25.4 |
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | [1] |  |  |  | $ 0.33 |  |  |  |  | $ 0.93 |
Weighted average limited partner units outstanding prior to the Restructuring, Basic: |  |  |  |  |  |  |  |  |  |  |
Units outstanding prior to the Restructuring, Basic | [1] |  |  |  | 27.3 |  |  |  |  | 27.3 |
Weighted average limited partner units outstanding prior to the Restructuring, Diluted: |  |  |  |  |  |  |  |  |  |  |
Units outstanding prior to the Restructuring, Diluted | [1] |  |  |  | 27.3 |  |  |  |  | 27.3 |
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 |  | $ 0.31 |  |  |  |  |  |  | $ 0.97 |  |
Net income attributable to Hess Midstream LP per Class A share, Diluted |  | $ 0.31 |  |  |  |  |  |  | $ 0.95 |  |
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Weighted average Class A shares outstanding subsequent to the restructuring, Basic |  | 18.0 |  |  |  |  |  |  | 18.0 |  |
Weighted average Class A shares outstanding subsequent to the restructuring, Diluted |  | 18.1 |  |  |  |  |  |  | 18.1 |  |
[1] | The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.

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