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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenues |  |  |  |  |  |  |
Affiliate services |  | $ 264.7 | $ 214.9 | [1] | $ 825.1 | $ 594.5 | [1]
Type of Revenue [Extensible List] |  | hesm:AffiliateServicesMember | hesm:AffiliateServicesMember | [1] | hesm:AffiliateServicesMember | hesm:AffiliateServicesMember | [1]
Other income |  | $ 0.1 |  |  | $ 0.3 | $ 0.3 | [1]
Total revenues |  | 264.8 | $ 214.9 | [1] | 825.4 | 594.8 | [1]
Costs and expenses |  |  |  |  |  |  |
Operating and maintenance expenses (exclusive of depreciation shown separately below) |  | 83.9 | 71.9 | [1] | 270.8 | 184.1 | [1]
Depreciation expense |  | 39.5 | 36.0 | [1] | 116.9 | 105.0 | [1]
General and administrative expenses |  | 4.2 | 7.7 | [1] | 15.9 | 19.4 | [1]
Total costs and expenses |  | 127.6 | 115.6 | [1] | 403.6 | 308.5 | [1]
Income from operations |  | 137.2 | 99.3 | [1] | 421.8 | 286.3 | [1]
Income from equity investments |  | 3.6 | 0.5 | [1] | 7.2 | 0.5 | [1]
Interest expense, net |  | 23.2 | 12.4 | [1] | 71.3 | 44.2 | [1]
Gain on sale of property, plant and equipment |  |  |  |  | 0.1 |  |
Income before income tax expense (benefit) |  | 117.6 | 87.4 | [1] | 357.8 | 242.6 | [1]
Income tax expense (benefit) |  | 1.8 |  |  | 5.2 |  |
Net income |  | 115.8 | 87.4 | [1] | 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 |  |  |  |  |  |  |
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] |  | $ 0.33 |  |  | $ 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 |  |  |  |  |  |  |
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] |  | $ 0.33 |  |  | $ 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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