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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
May 31, 2019
Share-based Compensation Expense [Abstract]          
Share-based Compensation Expense $ 1.8 $ 1.8 $ 6.1 $ 6.3  
Estimated share-based compensation expense 9.5   9.5    
OSIP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         14,400,000
Stock Options [Member]          
Share-based Compensation Expense [Abstract]          
Share-based Compensation Expense 0.3 0.3 $ 2.0 2.0  
Number of options granted (in shares)     1,199,415    
Weighted-average grant-date fair value per share of options granted (dollars per share)     $ 1.52    
Number of options exercised (in shares)     0    
Restricted Stock [Member]          
Share-based Compensation Expense [Abstract]          
Share-based Compensation Expense 0.3 0.5 $ 1.8 2.4  
Number of shares granted (in shares)     768,304    
Weighted average grant date fair value, granted (dollars per share)     $ 2.66    
Intrinsic value of shares vested/restrictions lapsed during the period     $ 1.9    
Restricted Stock Units Issued to Directors [Member]          
Share-based Compensation Expense [Abstract]          
Share-based Compensation Expense 0.3 0.3 0.6 0.6  
Performance shares [Member]          
Share-based Compensation Expense [Abstract]          
Share-based Compensation Expense 0.6 0.6 $ 1.2 1.1  
Number of shares granted (in shares)     595,733    
Weighted average grant date fair value, granted (dollars per share)     $ 3.09    
Intrinsic value of shares vested/restrictions lapsed during the period     $ 0.7    
Long-term Performance Plan [Member]          
Share-based Compensation Expense [Abstract]          
Share-based Compensation Expense $ 0.3 $ 0.1 $ 0.5 $ 0.2  
Share-based Compensation, Executive Officer Target Allocation of Equity Under Comprehensive Award     50.00% 30.00%  
Share-based Compensation, Target Allocation of Equity Under Comprehensive Award (in hundredths)     30.00%