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Stock-Based Compensation and Other Incentive Plans (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1.0   $ 17.5 $ 10.4
Unrecognized share-based compensation expense     $ 40.1  
Weighted-average period for recognition of unrecognized share-based compensation expense     3 years  
Time Based Restricted Stock Units (RSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     1 year  
Time Based Restricted Stock Units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Performance Based Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Performance Based Restricted Stock Units (RSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Volatility rate (percent)     50.00%  
Performance Based Restricted Stock Units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Volatility rate (percent)     36.00%  
2016 Omnibus Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for incentive plan (in shares)     3.0  
Number of shares available for grant (in shares)     2.1  
Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite service period     3 years  
Compensation expense $ 1.6   $ 2.7 0.7
Amounts unpaid under long term incentive plan     $ 6.9 $ 8.7
Predecessor | Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense   $ 7.2