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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement [Abstract] |  |  |
Revenues | $ 3,318.3 | $ 2,881.1 | $ 4,623.4
Costs and expenses |  |  |
Operating costs and expenses (exclusive of items shown separately below) | 2,553.1 | 2,524.9 | 3,536.6
Depreciation, depletion and amortization | 308.7 | 346.0 | 601.0
Asset retirement obligation expenses | 44.7 | 45.7 | 58.4
Selling and administrative expenses | 84.9 | 99.5 | 145.0
Restructuring charges | 8.3 | 37.9 | 24.3
Transaction costs related to joint ventures | 0.0 | 23.1 | 21.6
Other operating (income) loss: |  |  |
Net gain on disposals | (31.5) | (15.2) | (2.1)
Gain on formation of United Wambo Joint Venture | 0.0 | 0.0 | (48.1)
Asset impairment | 0.0 | 1,487.4 | 270.2
Provision for North Goonyella equipment loss | 0.0 | 0.0 | 83.2
North Goonyella insurance recovery | 0.0 | 0.0 | (125.0)
(Income) loss from equity affiliates | (82.1) | 60.1 | (3.4)
Operating profit (loss) | 432.2 | (1,728.3) | 61.7
Interest expense | 183.4 | 139.8 | 144.0
Net (gain) loss on early debt extinguishment | 33.2 | 0.0 | (0.2)
Interest income | (6.5) | (9.4) | (27.0)
Net periodic benefit (credit) costs, excluding service cost | (38.3) | (1.8) | 19.4
Net mark-to-market adjustment on actuarially determined liabilities | (43.4) | (5.1) | 67.4
Income (loss) from continuing operations before income taxes | 370.2 | (1,851.8) | (142.3)
Income tax provision | 22.8 | 8.0 | 46.0
Income (loss) from continuing operations, net of income taxes | 347.4 | (1,859.8) | (188.3)
Income (loss) from discontinued operations, net of income taxes | 24.0 | (14.0) | 3.2
Net income (loss) | 371.4 | (1,873.8) | (185.1)
Less: Net income (loss) attributable to noncontrolling interests | 11.3 | (3.5) | 26.2
Net income (loss) attributable to common stockholders | $ 360.1 | $ (1,870.3) | $ (211.3)
Income (loss) from continuing operations: |  |  |
Basic income (loss) per share | $ 3.03 | $ (18.99) | $ (2.07)
Diluted income (loss) per share | 3.00 | (18.99) | (2.07)
Net income (loss) attributable to common stockholders: |  |  |
Basic income (loss) per share | 3.24 | (19.14) | (2.04)
Diluted income (loss) per share | $ 3.22 | $ (19.14) | $ (2.04)

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