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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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