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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Revenues $ 723.4 $ 626.7 $ 1,374.7 $ 1,472.9
Costs and expenses        
Operating costs and expenses (exclusive of items shown separately below) 611.4 556.3 1,194.0 1,335.8
Depreciation, depletion and amortization 77.1 88.3 145.4 194.3
Asset retirement obligation expenses 15.1 14.1 31.0 31.7
Selling and administrative expenses 21.4 25.2 43.1 50.1
Restructuring charges 2.1 16.5 4.2 23.0
Transaction costs related to joint ventures 0.0 12.9 0.0 17.1
Other operating (income) loss:        
Net (gain) loss on disposals (3.0) 0.2 (2.4) (7.9)
Loss from equity affiliates 3.5 6.0 4.4 15.1
Asset impairment 0.0 1,418.1 0.0 1,418.1
Operating loss (4.2) (1,510.9) (45.0) (1,604.4)
Interest expense 45.4 34.3 97.8 67.4
Net gain on early debt extinguishment 11.8 0.0 15.3 0.0
Interest income (1.3) (2.4) (2.8) (5.5)
Net periodic benefit (credit) costs, excluding service cost (8.7) 2.7 (17.4) 5.5
Loss from continuing operations before income taxes (27.8) (1,545.5) (107.3) (1,671.8)
Income tax (benefit) provision (4.8) (0.2) (6.6) 2.8
Loss from continuing operations, net of income taxes (23.0) (1,545.3) (100.7) (1,674.6)
Loss from discontinued operations, net of income taxes (2.3) (2.3) (4.3) (4.5)
Net loss (25.3) (1,547.6) (105.0) (1,679.1)
Less: Net income (loss) attributable to noncontrolling interests 3.3 (3.4) 3.7 (5.2)
Net loss attributable to common stockholders $ (28.6) $ (1,544.2) $ (108.7) $ (1,673.9)
Loss from continuing operations:        
Basic loss per share $ (0.26) $ (15.76) $ (1.05) $ (17.12)
Diluted loss per share (0.26) (15.76) (1.05) (17.12)
Net loss attributable to common stockholders:        
Basic loss per share (0.28) (15.78) (1.09) (17.16)
Diluted loss per share $ (0.28) $ (15.78) $ (1.09) $ (17.16)
Net gain on early debt extinguishment $ 11.8 $ 0.0 $ 15.3 $ 0.0
Net periodic benefit (credit) costs, excluding service cost $ (8.7) $ 2.7 $ (17.4) $ 5.5