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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Revenues |  |  |  |
Affiliate services | $ 294.8 | $ 269.8 | $ 583.6 | $ 560.4
Type of Revenue [Extensible List] | hesm:AffiliateServicesMember | hesm:AffiliateServicesMember | hesm:AffiliateServicesMember | hesm:AffiliateServicesMember
Other income |  |  |  | $ 0.2
Total revenues | $ 294.8 | $ 269.8 | $ 583.6 | 560.6
Costs and expenses |  |  |  |
Operating and maintenance expenses (exclusive of depreciation shown separately below) | 63.6 | 95.0 | 123.4 | 186.9
Depreciation expense | 40.4 | 38.9 | 80.6 | 77.4
General and administrative expenses | 5.2 | 4.1 | 11.5 | 11.7
Total costs and expenses | 109.2 | 138.0 | 215.5 | 276.0
Income from operations | 185.6 | 131.8 | 368.1 | 284.6
Income from equity investments | 2.9 | 0.9 | 5.6 | 3.6
Interest expense, net | 22.9 | 23.3 | 46.0 | 48.1
Gain on sale of property, plant and equipment |  | 0.1 |  | 0.1
Income before income tax expense | 165.6 | 109.5 | 327.7 | 240.2
Income tax expense | 3.6 | 1.7 | 6.1 | 3.4
Net income | 162.0 | 107.8 | 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 |  |  |  |
Costs and expenses |  |  |  |
Net income | $ 11.0 | $ 5.3 |  |
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 subsequent to the restructuring, Basic | 25.0 | 18.0 | 22.2 | 18.0
Weighted average Class A shares outstanding subsequent to the restructuring, Diluted | 25.1 | 18.1 | 22.3 | 18.1

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