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Segments - Financial Data for Each Reportable Segment (Detail) - USD ($) $ 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues and other income |  | $ 294.8 |  | $ 269.8 |  | $ 583.6 | $ 560.6
Net income (loss) |  | 162.0 | $ 159.6 | 107.8 | $ 129.0 | 321.6 | 236.8
Net income (loss) attributable to Hess Midstream LP |  | 11.0 |  | 5.3 |  | 19.6 | 11.8
Depreciation expense |  | 40.4 |  | 38.9 |  | 80.6 | 77.4
Proportional share of equity affiliates' depreciation |  | 1.3 |  | 1.2 |  | 2.6 | 2.5
Income from equity investments |  | 2.9 |  | 0.9 |  | 5.6 | 3.6
Interest expense, net |  | 22.9 |  | 23.3 |  | 46.0 | 48.1
Income tax expense (benefit) |  | 3.6 |  | 1.7 |  | 6.1 | 3.4
Gain on sale of property, plant and equipment |  |  |  | 0.1 |  |  | 0.1
Adjusted EBITDA |  | 230.2 |  | 172.8 |  | 456.9 | 368.1
Capital expenditures | [1] | 46.4 |  | 78.8 |  | 69.5 | 135.8
Interest and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net income (loss) |  | (28.1) |  | (25.6) |  | (55.8) | (55.9)
Net income (loss) attributable to Hess Midstream LP |  | (5.8) |  | (3.1) |  | (10.0) | (6.7)
Interest expense, net |  | 22.9 |  | 23.3 |  | 46.0 | 48.1
Income tax expense (benefit) |  | 3.6 |  | 1.7 |  | 6.1 | 3.4
Adjusted EBITDA |  | (1.6) |  | (0.6) |  | (3.7) | (4.4)
Gathering Opco | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues and other income |  | 154.6 |  | 136.4 |  | 307.3 | 278.0
Net income (loss) |  | 92.4 |  | 71.7 |  | 184.8 | 147.6
Net income (loss) attributable to Hess Midstream LP |  | 8.1 |  | 4.6 |  | 14.5 | 9.4
Depreciation expense |  | 25.2 |  | 23.7 |  | 50.1 | 47.0
Gain on sale of property, plant and equipment |  |  |  | 0.1 |  |  | 0.1
Adjusted EBITDA |  | 117.6 |  | 95.3 |  | 234.9 | 194.5
Capital expenditures | [1] | 38.2 |  | 25.9 |  | 57.6 | 41.7
Processing and Storage | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues and other income |  | 105.3 |  | 86.8 |  | 208.8 | 183.8
Net income (loss) |  | 71.6 |  | 45.8 |  | 142.5 | 108.5
Net income (loss) attributable to Hess Midstream LP |  | 6.3 |  | 2.8 |  | 11.1 | 6.8
Depreciation expense |  | 11.2 |  | 11.2 |  | 22.4 | 22.4
Proportional share of equity affiliates' depreciation |  | 1.3 |  | 1.2 |  | 2.6 | 2.5
Income from equity investments |  | 2.9 |  | 0.9 |  | 5.6 | 3.6
Adjusted EBITDA |  | 84.1 |  | 58.2 |  | 167.5 | 133.4
Capital expenditures | [1] | 8.1 |  | 52.7 |  | 11.8 | 93.8
Terminaling and Export | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues and other income |  | 34.9 |  | 46.6 |  | 67.5 | 98.8
Net income (loss) |  | 26.1 |  | 15.9 |  | 50.1 | 36.6
Net income (loss) attributable to Hess Midstream LP |  | 2.4 |  | 1.0 |  | 4.0 | 2.3
Depreciation expense |  | 4.0 |  | 4.0 |  | 8.1 | 8.0
Adjusted EBITDA |  | 30.1 |  | 19.9 |  | 58.2 | 44.6
Capital expenditures | [1] | $ 0.1 |  | $ 0.2 |  | $ 0.1 | $ 0.3
[1] | Includes acquisition, expansion and maintenance capital expenditures, as applicable

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