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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated share-based compensation expense $ 8.1   $ 8.1  
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 1.3 $ 1.2 $ 5.5 $ 3.2
Number of options granted (in shares)     513,600  
Weighted-average grant-date fair value per share of options granted (dollars per share)     $ 5.33  
Number of options exercised (in shares)     58,999  
Stock Options [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 0.2 0.1 $ 1.7 0.6
Restricted Stock [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 0.4 0.3 $ 2.3 1.1
Number of shares granted (in shares)     355,600  
Weighted average grant date fair value, granted (dollars per share)     $ 9.78  
Intrinsic value of shares vested/restrictions lapsed during the period     $ 4.1  
Restricted Stock Units Issued to Directors [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 0.3 0.4 0.7 0.7
Performance shares [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 0.4 $ 0.4 $ 0.8 $ 0.8
Number of shares granted (in shares)     263,600  
Weighted average grant date fair value, granted (dollars per share)     $ 10.78  
Intrinsic value of shares vested/restrictions lapsed during the period     $ 4.5