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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenue from physical sale of coal $ 109.4 $ 470.7 $ 140.3
Other Income 41.3 11.2 10.6
Revenue from physical sale of coal 4,946.7 4,981.9 3,318.3
Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Revenue from physical sale of coal 228.8 1.7 (3.7)
Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total Unrealized gain (loss) recognized in income on derivatives 154.9 (28.5) (121.1)
Total (Loss) gain realized in income on derivatives (78.7) (460.1) (39.2)
Trading revenue 76.2 (488.6) (160.3)
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument | Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Total Unrealized gain (loss) recognized in income on derivatives 159.0 (35.8) (115.1)
Derivative contracts related to forecasted sales | Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total Unrealized gain (loss) recognized in income on derivatives 159.0 (35.8) (115.1)
Total (Loss) gain realized in income on derivatives (80.9) (455.1) (45.6)
Trading revenue 78.1 (490.9) (160.7)
Derivative contracts related to forecasted sales | Designated as Hedging Instrument | Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Total (Loss) gain realized in income on derivatives (80.9) (455.1) (45.6)
Financial trading contracts | Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total Unrealized gain (loss) recognized in income on derivatives (11.5) 9.6 1.5
Total (Loss) gain realized in income on derivatives 11.5 1.1 4.6
Trading revenue 0.0 10.7 6.1
Financial trading contracts | Designated as Hedging Instrument | Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Trading revenue $ 0.0 $ 10.7 $ 6.1