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Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Successor |  |
Inventories [Line Items] |  |
Materials and supplies | $ 105.0 |
Raw coal | 55.3 |
Saleable coal | 153.2 |
Total | $ 313.5 |
Predecessor |  |
Inventories [Line Items] |  |
Materials and supplies |  | $ 104.5
Raw coal |  | 29.6
Saleable coal |  | 69.6
Total |  | $ 203.7

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