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Discontinued Operations - Loss, Assets and Liabilities of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Apr. 01, 2017
Sep. 30, 2017
Sep. 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 $ (4.1) $ (3.7)   $ (6.4) $ (9.0)  
Successor | Discontinued Operations, Held-for-sale or Disposed of by Sale            
Assets:            
Other current assets 0.5       0.5 $ 0.3
Total assets classified as discontinued operations 0.5       0.5 0.3
Liabilities:            
Accounts payable and accrued expenses 70.8       70.8 70.6
Other noncurrent liabilities 156.0       156.0 170.0
Total liabilities classified as discontinued operations $ 226.8       $ 226.8 $ 240.6
Predecessor            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss from discontinued operations, net of income taxes     $ (16.2)