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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Inventory [Line Items] |  |
Materials and supplies | $ 102.1 | $ 102.6
Raw coal | 54.6 | 70.5
Saleable coal | 70.0 | 88.5
Inventories | 226.7 | 261.6
Material And Supplies |  |
Inventory [Line Items] |  |
Inventory reserves | $ 9.0 | $ 10.4

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