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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue from physical sale of coal | $ 27.8 | $ 109.4 | $ 470.7
Other Income | 18.0 | 41.3 | 11.2
Revenue from physical sale of coal | 4,236.7 | 4,946.7 | 4,981.9
Corporate and Other (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from physical sale of coal | 45.8 | 228.8 | 1.7
Designated as Hedging Instrument |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Unrealized gain (loss) recognized in income on derivatives | (9.0) | 154.9 | (28.5)
Total (Loss) gain realized in income on derivatives | (3.7) | (78.7) | (460.1)
Trading revenue | (12.7) | 76.2 | (488.6)
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 | 159.0 | (35.8)
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)
Total (Loss) gain realized in income on derivatives |  | (80.9) | (455.1)
Trading revenue |  | 78.1 | (490.9)
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 | (80.9) | (455.1)
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
Total (Loss) gain realized in income on derivatives |  | 11.5 | 1.1
Trading revenue |  | 0.0 | 10.7
Financial trading contracts | Designated as Hedging Instrument | Corporate and Other (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Trading revenue | $ 0.0 | $ 0.0 | $ 10.7

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