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Income Taxes Income Tax Refunds, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Predecessor        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net $ 5.5   $ (40.1) $ (25.8)
Predecessor | Domestic Tax Authority [Member]        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net 0.0   (56.5) (38.1)
Predecessor | State and Local Jurisdiction [Member]        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net 0.0   1.4 0.4
Predecessor | Foreign Tax Authority [Member]        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net $ 5.5   $ 15.0 $ 11.9
Successor        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net   $ (0.8)    
Successor | Domestic Tax Authority [Member]        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net   (11.2)    
Successor | State and Local Jurisdiction [Member]        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net   0.0    
Successor | Foreign Tax Authority [Member]        
Income Tax Refunds, Net [Line Items]        
Income Taxes Paid, Net   $ 10.4