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Discontinued Operations - Loss, Assets and Liabilities of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Apr. 01, 2017
Jun. 30, 2018
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   $ (3.6) $ (2.7)   $ (4.9)  
Successor | Discontinued Operations, Held-for-sale or Disposed of by Sale            
Assets:            
Other current assets   0.5     0.5  
Total assets classified as discontinued operations   0.5     0.5  
Liabilities:            
Accounts payable and accrued expenses   70.9     70.9  
Other noncurrent liabilities   171.1     171.1  
Total liabilities classified as discontinued operations   $ 242.0     $ 242.0  
Predecessor            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss from discontinued operations, net of income taxes $ (12.1)     $ (16.2)    
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