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Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Inventory Disclosure [Abstract] |  |
Materials and supplies, net | $ 116.9 | $ 102.1
Raw coal | 63.4 | 54.6
Saleable coal | 72.6 | 70.0
Inventories, net | 252.9 | 226.7
Material and supplies |  |
Inventory [Line Items] |  |
inventory reserves | $ 8.2 | $ 9.0

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