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Income Taxes Reconciliation of Unrecognized Tax Benefits (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        
Reconciliation of Unrecognized Tax Benefits [Line Items]        
Balance at beginning of period     $ 12.7  
Additions for current year tax positions   $ 0.8 1.8  
Reductions for prior year tax positions   (0.5) 0.0  
Reductions for settlements with tax authorities   (0.1) (0.5)  
Balance at end of period   12.7 $ 14.0  
Predecessor        
Reconciliation of Unrecognized Tax Benefits [Line Items]        
Balance at beginning of period $ 20.1 $ 12.5   $ 22.9
Additions for current year tax positions 0.0     1.5
Reductions for prior year tax positions (7.6)     (2.8)
Reductions for settlements with tax authorities 0.0     (1.5)
Balance at end of period $ 12.5     $ 20.1