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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | ---
Successor |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Materials and supplies | $ 101.5 |  |  |  |
Raw coal | 78.1 |  |  |  |
Saleable coal | 111.7 |  |  |  |
Total | 291.3 |  |  |  |
Predecessor |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Materials and supplies |  |  | $ 104.5 |  |
Raw coal |  |  | 29.6 |  |
Saleable coal |  |  | 69.6 |  |
Total |  |  | 203.7 |  |
Reserve for materials and supplies [Member] | Successor |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Valuation Allowances and Reserves, Balance | $ 0.6 | $ 0.0 |  |  |
Reserve for materials and supplies [Member] | Predecessor |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Valuation Allowances and Reserves, Balance |  | $ 0.0 | $ 5.6 | $ 4.7 | $ 4.6

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