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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Inventory [Line Items] |  |
Materials and supplies, net | $ 157.5 | $ 153.0
Raw coal | 109.6 | 105.6
Saleable coal | 126.3 | 93.2
Inventories, net | 393.4 | 351.8
Material And Supplies |  |
Inventory [Line Items] |  |
Inventory reserves | $ 3.5 | $ 7.2

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