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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Revenue from physical sale of coal $ 35.4 $ 27.8 $ 109.4
Other Income 20.7 18.0 41.3
Revenue from physical sale of coal 3,861.5 4,236.7 4,946.7
Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Revenue from physical sale of coal 56.1 45.8 228.8
Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total Unrealized gain (loss) recognized in income on derivatives 6.0 (9.0) 154.9
Total (Loss) gain realized in income on derivatives (2.7) (3.7) (78.7)
Trading revenue 3.3 (12.7) 76.2
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 0.0 0.0 159.0
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
Total (Loss) gain realized in income on derivatives     (80.9)
Trading revenue     78.1
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 $ 0.0 $ 0.0 (80.9)
Financial trading contracts | Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total Unrealized gain (loss) recognized in income on derivatives     (11.5)
Total (Loss) gain realized in income on derivatives     11.5
Trading revenue     $ 0.0