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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

The average strike price on a group of foreign currency option contracts such as put options or call options.

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Cap rate on a foreign currency derivative for example, but not limited to, a cap or a collar.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Nominal mass used to calculate payments on a derivative instrument.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Description of uncertainty of fair value measurement from use of unobservable input, including, but not limited to, inter-relationships among inputs used in fair value measurement.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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