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Inventories (Details) - Successor - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory [Line Items] |  |
Materials and supplies | $ 118.1 | $ 101.5
Raw coal | 53.6 | 78.1
Saleable coal | 108.5 | 111.7
Inventories | 280.2 | 291.3
Reserve for materials and supplies |  |
Inventory [Line Items] |  |
Materials and supplies reserves | $ 0.2 | $ 0.6

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