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Segment Information Reconciliation to Adjusted EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Segment Reporting [Abstract]      
(Loss) income from continuing operations, net of income taxes $ (129.3) $ 133.3  
Depreciation, depletion and amortization 106.0 172.5  
Asset retirement obligation expenses 17.6 13.8  
Restructuring Charges 6.5 0.2  
Transaction costs related to joint ventures 4.2 0.0  
Provision for North Goonyella equipment loss 0.0 24.7 $ 66.4
North Goonyella insurance recovery - equipment (1) 0.0 (91.1)  
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates (0.7) 0.0  
Interest expense 33.1 35.8  
Interest income (3.1) (8.3)  
Unrealized losses (gains) on economic hedges 2.2 (39.8)  
Unrealized gains on non-coal trading derivative contracts (0.1) (0.2)  
Fresh start take-or-pay contract-based intangible recognition (2.6) (5.6)  
Income tax provision 3.0 18.8  
Total Adjusted EBITDA 36.8 254.1  
Insurance recovery related to North Goonyella equipment losses 0.0 $ 125.0  
Business Interruption Losses $ 33.9