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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

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