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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated share-based compensation expense $ 8.6   $ 8.6  
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 1.3 $ 1.6 $ 7.2 $ 7.2
Number of options granted (in shares)     906,700  
Weighted-average grant-date fair value per share of options granted (dollars per share)     $ 2.36  
Number of options exercised (in shares)     2,733  
Stock Options [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 0.1 0.2 $ 1.6 1.5
Restricted Stock [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 0.3 0.4 $ 2.9 2.7
Number of shares granted (in shares)     886,060  
Weighted average grant date fair value, granted (dollars per share)     $ 4.06  
Intrinsic value of shares vested/restrictions lapsed during the period     $ 2.9  
Restricted Stock Units Issued to Directors [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense 0.3 0.4 0.9 0.9
Performance Share Awards [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 0.6 $ 0.6 $ 1.8 $ 2.1
Number of shares granted (in shares)     890,700  
Weighted average grant date fair value, granted (dollars per share)     $ 3.09