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Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
Materials and supplies, net	$ 157.5	$ 153.0
Raw coal	109.6	105.6
Saleable coal	126.3	93.2
Inventories, net	393.4	351.8
Material And Supplies
Inventory [Line Items]
Inventory reserves	$ 3.5	$ 7.2

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Raw coal.

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Saleable coal.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

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Amount of valuation reserve for inventory.

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