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Adjustments to PP&E (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Revaluation of Assets |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net |  | $ 3,461.4 |  |
Fresh-start adjustment, increase (decrease), accumulated depreciation, depletion and amortization |  | 5,266.9 |  |
Predecessor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Preconfirmation, property, plant, equipment and mine development, net |  | 8,653.9 |  |
Preconfirmation, accumulated depreciation, depletion and amortization |  | (5,266.9) |  |
Asset retirement obligations |  | 664.2 | $ 758.8 | $ 712.1
Successor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, property, plant, equipment and mine development, net |  | 5,192.5 |  |
Postconfirmation, accumulated depreciation, depletion and amortization |  | 0.0 |  |
Asset retirement obligations | $ 691.1 | 664.2 |  |
Land and coal interests | Revaluation of Assets |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net |  | 6,511.8 |  |
Land and coal interests | Predecessor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Preconfirmation, property, plant, equipment and mine development, net |  | 10,297.7 |  |
Land and coal interests | Successor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, property, plant, equipment and mine development, net |  | 3,785.9 |  |
PP&E, fair value |  | 3,504.7 |  |
Asset retirement obligations |  | 281.2 |  |
Buildings and improvements [Member] | Revaluation of Assets |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net |  | 1,013.2 |  |
Buildings and improvements [Member] | Predecessor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Preconfirmation, property, plant, equipment and mine development, net |  | 1,479.3 |  |
Buildings and improvements [Member] | Successor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, property, plant, equipment and mine development, net |  | 466.1 |  |
Machinery and equipment | Revaluation of Assets |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net |  | 1,203.3 |  |
Machinery and equipment | Predecessor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Preconfirmation, property, plant, equipment and mine development, net |  | 2,143.8 |  |
Machinery and equipment | Successor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, property, plant, equipment and mine development, net |  | $ 940.5 |  |

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