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Revenue Recognition - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Disaggregation of Revenue [Line Items]          
Accounts receivable, credit loss expense (reversal)   $ 0   $ 0  
Revenue $ 1,342,500,000 679,000,000.0 $ 3,355,800,000 2,053,700,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue 1,342,500,000 679,000,000.0 3,355,800,000 2,053,700,000  
Corporate and Other (1)          
Disaggregation of Revenue [Line Items]          
Revenue 126,700,000 (192,900,000) (230,100,000) (185,600,000)  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue 126,700,000 (192,900,000) (230,100,000) (185,600,000)  
Designated as Hedging Instrument          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Unrealized (loss) gain recognized in income on derivatives 88,800,000 (237,800,000) (229,400,000) (271,500,000)  
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) gain recognized in income on derivatives $ 90,400,000 $ (238,400,000) $ (235,100,000) $ (264,000,000.0)