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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Materials and supplies, net | $ 161.6 | $ 157.5
Raw coal | 95.6 | 109.6
Saleable coal | 126.0 | 126.3
Inventories, net | 383.2 | 393.4
Material And Supplies |  |
Inventory [Line Items] |  |
Inventory reserves | $ 5.1 | $ 3.5

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