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Derivatives and Fair Value Measurements - Textual (Details) t in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) t | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2023 AUD ($) | Sep. 30, 2023 AUD ($) $ / $ | Jan. 01, 2023 AUD ($) | Dec. 31, 2022 AUD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Collateral, Right to Reclaim Cash | $ 255.5 | $ 130.1 |  | $ 255.5 | $ 130.1 |  |  |  |  |
Revenues |  |  |  | $ 4,981.9 | 3,318.3 | $ 2,881.1 |  |  |  |
Unobservable Measurement Input, Uncertainty, Description |  |  |  | 10 |  |  |  |  |  |
Coal Trading |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Collateral, Right to Reclaim Cash | 57.5 | 38.3 |  | $ 57.5 | 38.3 |  |  |  |  |
Purchases |  |  |  | 0.2 | 0.0 | 0.0 |  |  |  |
Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  |  |  | (28.5) | (121.1) | (27.4) |  |  |  |
Designated as Hedging Instrument | Net Amount |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 198.0 | 91.8 |  | 198.0 | 91.8 |  |  |  |  |
Foreign currency option contracts |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  | $ 745,000,000
Foreign currency option contracts | Subsequent Event |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | $ 150,000,000 | $ 135,000,000 |  |
Derivative, Average Foreign Currency Option Strike Price |  |  |  |  |  |  | 0.75 |  |  |
Foreign currency option contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  |  |  | $ (2.3) | (7.5) | 7.1 |  |  |  |
Diesel Fuel Hedge Contracts |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  | $ 0
Financial trading contracts |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | t |  |  |  | 0.6 |  |  |  |  |  |
Financial trading contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  |  |  | $ 9.6 | 1.5 | (4.9) |  |  |  |
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  |  |  | $ (35.8) | $ (115.1) | (29.6) |  |  |  |
Gain (Loss) on Derivative Instruments | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives | (65.0) | (86.0) | $ (28.0) |  |  |  |  |  |  |
Forward Contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives | $ 29.0 | $ (29.0) |  |  |  | $ (1.0) |  |  |  |
Scenario, Forecast | Foreign currency option contracts |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Floor Price |  |  |  |  |  |  |  |  | 0.63 |
Derivative, Cap Price |  |  |  |  |  |  |  |  | 0.75 |
Scenario, Forecast | Foreign currency option contracts | Minimum |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  |  |  |  |  |  |  | 0.70 |  |
Scenario, Forecast | Foreign currency option contracts | Maximum |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  |  |  |  |  |  |  | 0.77 |  |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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