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Revenue Recognition - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Disaggregation of Revenue [Line Items]          
Accounts receivable, credit loss expense (reversal)   $ 0   $ 0  
Revenue $ 1,321,900,000 723,400,000 $ 2,013,300,000 1,374,700,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue 1,321,900,000 723,400,000 2,013,300,000 1,374,700,000  
Corporate and Other (1)          
Disaggregation of Revenue [Line Items]          
Revenue (21,400,000) (2,400,000) (356,800,000) 7,300,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue (21,400,000) (2,400,000) (356,800,000) 7,300,000  
Designated as Hedging Instrument          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Unrealized loss recognized in income on derivatives (31,400,000) (21,100,000) (318,300,000) (33,600,000)  
Trade receivables          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Accounts receivable, allowance for credit loss 0   0   $ 0
Accounts receivable, allowance for credit loss 0   0   0
Miscellaneous Receivables          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Accounts receivable, allowance for credit loss 0   0   0
Accounts receivable, allowance for credit loss 0   0   $ 0
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Unrealized loss recognized in income on derivatives $ (24,500,000) $ (23,700,000) $ (325,500,000) $ (25,600,000)