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Derivatives and Fair Value Measurements - Textual (Details) | 3 Months Ended | 12 Months Ended |  |
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Mar. 31, 2022 t | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2023 t | Dec. 31, 2022 USD ($) t | Dec. 31, 2021 USD ($) t | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2022 $ / $ | Dec. 31, 2021 AUD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Collateral, Right to Reclaim Cash |  | $ 130,100,000 | $ 9,500,000 |  |  |  | $ 130,100,000 | $ 9,500,000 |  |  |
Revenues |  |  |  |  |  |  | 3,318,300,000 | 2,881,100,000 | $ 4,623,400,000 |  |
Margin Deposit Assets |  | 91,800,000 | 6,500,000 |  |  |  | $ 91,800,000 | 6,500,000 |  |  |
Unobservable Measurement Input, Uncertainty, Description |  |  |  |  |  |  | 10 |  |  |  |
Trading and Brokerage Coal Deliveries |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | (28,500,000) | (18,800,000) |  |
Coal Trading |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Collateral, Right to Reclaim Cash |  | 38,300,000 | 3,000,000 |  |  |  | $ 38,300,000 | 3,000,000 |  |  |
Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  |  |  |  |  |  | (121,100,000) | (27,400,000) | 51,800,000 |  |
Designated as Hedging Instrument | Net Amount |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 91,800,000 | 6,500,000 |  |  |  | 91,800,000 | 6,500,000 |  |  |
Foreign currency option contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  |  | $ 535,000,000
Foreign currency option contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  |  |  |  |  |  | $ (7,500,000) | 7,100,000 | 1,200,000 |  |
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 |  |  |  |  |  |  | 2,500,000 |  |  |  |
Financial trading contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  |  |  |  |  |  | $ 1,500,000 | (4,900,000) | 8,400,000 |  |
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 |  |  |  |  |  |  | $ (113,700,000) | $ (34,500,000) | $ 50,600,000 |  |
Gain (Loss) on Derivative Instruments | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  | 86,000,000 | 28,000,000 | $ 42,000,000 |  |  |  |  |  |  |
Forward Contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain recognized in income on derivatives |  | $ 29,000,000 | $ 1,000,000 |  |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Price per ton |  |  |  |  |  | $ 84 |  |  |  |  |
Scenario, Forecast | Foreign currency option contracts | Minimum |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  |  |  |  |  |  |  |  |  | 0.76 |
Scenario, Forecast | Foreign currency option contracts | Maximum |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  |  |  |  |  |  |  |  |  | 0.80 |
Scenario, Forecast | Financial trading contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | t | 400,000 |  |  |  |  | 2,100,000 |  |  |  |  |
Scenario, Forecast | Coal Contract to settle in 2022 |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | t |  |  |  |  |  | 1,400,000 |  |  |  |  |
Scenario, Forecast | Coal Contract to settle in 2023 |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | t |  |  |  |  | 700,000 |  |  |  |  |  |

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