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Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Materials and supplies, net	$ 130.8	$ 102.1
Raw coal	98.3	54.6
Saleable coal	67.0	70.0
Inventories, net	296.1	226.7
Material And Supplies
Inventory [Line Items]
Inventory reserves	$ 9.5	$ 9.0

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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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