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Discontinued Operations - Loss, Assets and Liabilities of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Successor      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss from discontinued operations, net of income taxes $ (1.3)    
Successor | Discontinued Operations, Held-for-sale or Disposed of by Sale      
Assets:      
Other current assets 0.6    
Total assets classified as discontinued operations 0.6    
Liabilities:      
Accounts payable and accrued expenses 70.7    
Other noncurrent liabilities 170.6    
Total liabilities classified as discontinued operations $ 241.3    
Predecessor      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss from discontinued operations, net of income taxes   $ (4.1)  
Predecessor | Discontinued Operations, Held-for-sale or Disposed of by Sale      
Assets:      
Other current assets     $ 0.3
Total assets classified as discontinued operations     0.3
Liabilities:      
Accounts payable and accrued expenses     70.6
Other noncurrent liabilities     170.0
Total liabilities classified as discontinued operations     $ 240.6