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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Revenues |  |  |  |  |  |  |
Affiliate services |  | $ 269.8 | $ 190.2 | [1] | $ 560.4 | $ 379.6 | [1]
Type of Revenue [Extensible List] |  | hesm:AffiliateServicesMember | hesm:AffiliateServicesMember | [1] | hesm:AffiliateServicesMember | hesm:AffiliateServicesMember | [1]
Other income |  |  | $ 0.1 | [1] | $ 0.2 | $ 0.3 | [1]
Total revenues |  | $ 269.8 | 190.3 | [1] | 560.6 | 379.9 | [1]
Costs and expenses |  |  |  |  |  |  |
Operating and maintenance expenses (exclusive of depreciation shown separately below) |  | 95.0 | 57.9 | [1] | 186.9 | 112.2 | [1]
Depreciation expense |  | 38.9 | 35.4 | [1] | 77.4 | 69.0 | [1]
General and administrative expenses |  | 4.1 | 5.8 | [1] | 11.7 | 11.7 | [1]
Total costs and expenses |  | 138.0 | 99.1 | [1] | 276.0 | 192.9 | [1]
Income from operations |  | 131.8 | 91.2 | [1] | 284.6 | 187.0 | [1]
Income from equity investments |  | 0.9 |  |  | 3.6 |  |
Interest expense, net |  | 23.3 | 16.8 | [1] | 48.1 | 31.8 | [1]
Gain on sale of property, plant and equipment |  | 0.1 |  |  | 0.1 |  |
Income before income tax expense (benefit) |  | 109.5 | 74.4 | [1] | 240.2 | 155.2 | [1]
Income tax expense (benefit) |  | 1.7 |  |  | 3.4 |  |
Net income |  | 107.8 | 74.4 | [1] | 236.8 | 155.2 | [1]
Less: Net income (loss) attributable to net parent investment | [1] |  | (16.5) |  |  | (31.0) |
Less: Net income (loss) attributable to noncontrolling interest |  | 102.5 | 74.1 | [1] | 225.0 | 151.3 | [1]
Net income attributable to Hess Midstream LP |  | 5.3 | 16.8 | [1] | 11.8 | 34.9 | [1]
Less: General partner's interest in net income | [1] |  | 1.0 |  |  | 1.8 |
Limited partners' interest in net income |  | $ 5.3 | $ 15.8 | [1] | $ 11.8 | $ 33.1 | [1]
Common Units |  |  |  |  |  |  |
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted): |  |  |  |  |  |  |
Net income attributable to Hess Midstream Partners per limited partner unit | [1] |  | $ 0.29 |  |  | $ 0.61 |
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 |  |  |  |  |  |  |
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted): |  |  |  |  |  |  |
Net income attributable to Hess Midstream Partners per limited partner unit | [1] |  | $ 0.29 |  |  | $ 0.61 |
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 |  | $ 0.29 |  |  | $ 0.66 |  |
Net income attributable to Hess Midstream LP per Class A share, Diluted |  | $ 0.29 |  |  | $ 0.64 |  |
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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