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Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Loss from continuing operations, net of income taxes $ (23.0) $ (1,545.3) $ (100.7) $ (1,674.6)
Depreciation, depletion and amortization 77.1 88.3 145.4 194.3
Asset retirement obligation expenses 15.1 14.1 31.0 31.7
Restructuring charges 2.1 16.5 4.2 23.0
Transaction costs related to joint ventures 0.0 12.9 0.0 17.1
Asset impairment 0.0 1,418.1 0.0 1,418.1
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates (0.5) (0.4) (2.0) (1.1)
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)
Unrealized losses (gains) on economic hedges 23.7 (7.0) 25.6 (4.8)
Unrealized losses (gains) on non-coal trading derivative contracts 1.2 (2.8) 8.8 (2.9)
Take-or-pay contract-based intangible recognition (1.1) (2.7) (2.2) (5.3)
Income tax (benefit) provision (4.8) (0.2) (6.6) 2.8
Adjusted EBITDA $ 122.1 $ 23.4 $ 183.2 $ 60.2