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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated share-based compensation expense $ 5.7  
Share-based Compensation Expense [Abstract]    
Share-based Compensation Expense $ 2.0 $ 4.2
Number of options granted (in shares) 615,610  
Weighted-average grant-date fair value per share of options granted (dollars per share) $ 1.26  
Number of options exercised (in shares) 0  
Stock Options [Member]    
Share-based Compensation Expense [Abstract]    
Share-based Compensation Expense $ 0.5 1.2
Restricted Stock [Member]    
Share-based Compensation Expense [Abstract]    
Share-based Compensation Expense $ 0.8 2.1
Number of shares granted (in shares) 608,170  
Weighted average grant date fair value, granted (dollars per share) $ 1.76  
Intrinsic value of shares vested/restrictions lapsed during the period $ 1.4  
Restricted Stock Units Issued to Directors [Member]    
Share-based Compensation Expense [Abstract]    
Share-based Compensation Expense 0.3 0.3
Performance Share Awards [Member]    
Share-based Compensation Expense [Abstract]    
Share-based Compensation Expense $ 0.4 $ 0.6
Number of shares granted (in shares) 484,500  
Weighted average grant date fair value, granted (dollars per share) $ 1.74