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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