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Discontinued Operations Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Liabilities subject to compromise |  | $ 8,416.7 | $ 8,440.2
Predecessor |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Other Assets, Current |  |  | 0.2
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  |  | 15.9
Disposal Group, Including Discontinued Operation, Assets |  |  | 16.1
Disposal Group, Including Discontinued Operation, Liabilities, Current |  |  | 55.9
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent |  |  | 198.5
Liabilities subject to compromise |  |  | 8,440.2
Disposal Group, Including Discontinued Operation, Liabilities |  |  | 275.3
Successor |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Other Assets, Current | $ 0.3 |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent | 0.0 |  |
Disposal Group, Including Discontinued Operation, Assets | 0.3 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 70.6 |  |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | 170.0 |  |
Liabilities subject to compromise | 0.0 |  |
Disposal Group, Including Discontinued Operation, Liabilities | 240.6 |  |
Discontinued Operations [Member] | Predecessor |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Liabilities subject to compromise |  |  | $ 20.9
Discontinued Operations [Member] | Successor |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Liabilities subject to compromise | $ 0.0 |  |

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