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Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Inventory [Line Items]
Materials and supplies, net	$ 167.2	$ 157.5
Raw coal	100.4	109.6
Saleable coal	149.9	126.3
Inventories, net	$ 417.5	$ 393.4

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- Definition

Raw coal.

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Saleable coal.

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- Definition

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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