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Discontinued Operations Results (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Successor        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of income taxes   $ (19.8) $ 18.1  
Predecessor        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of income taxes $ (16.2)     $ (57.6)