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Derivatives and Fair Value Measurements - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) $ / $	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) $ / $	Sep. 30, 2023 USD ($)	Sep. 30, 2024 AUD ($) $ / $	Dec. 31, 2023 USD ($)
Derivatives, Fair Value [Line Items]
Unobservable Measurement Input, Uncertainty, Description			10
Asset impairment	$ 0.0	$ 0.0	$ 0.0	$ 2.0
Fair Value, Inputs, Level 1, 2 and 3
Derivatives, Fair Value [Line Items]
Transfers Between Fair Value Measurement Hierarchy Levels	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Notional amount					$ 531,000,000.0
Foreign Exchange Contract [Member] | Minimum
Derivatives, Fair Value [Line Items]
Derivative, exchange rate cap (in dollars per share) | $ / $	0.70		0.70		0.70
Foreign Exchange Contract [Member] | Maximum
Derivatives, Fair Value [Line Items]
Derivative, exchange rate cap (in dollars per share) | $ / $	0.74		0.74		0.74
Foreign Exchange Contract [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 6.4		$ 6.4			$ 6.2
Coal derivative contracts related to forecasted sales
Derivatives, Fair Value [Line Items]
Notional amount					$ 0
Foreign Exchange Option
Derivatives, Fair Value [Line Items]
Notional amount					$ 468,000,000
Derivative, Floor Price					0.60
Derivative, Cap Price					0.73

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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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Nominal or face amount used to calculate payment on derivative.

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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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