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Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Materials and supplies	$ 104.3	$ 102.6
Raw coal	52.4	70.5
Saleable coal	84.7	88.5
Total	241.4	261.6
Material and supplies
Inventory [Line Items]
inventory reserves	10.5	$ 10.4
Coal
Inventory [Line Items]
inventory reserves	$ 5.5

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Raw 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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