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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Materials and supplies, net | $ 160.1 | $ 157.5
Raw coal | 107.5 | 109.6
Saleable coal | 150.4 | 126.3
Inventories, net | $ 418.0 | $ 393.4

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