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Share-Based Compensation Plans - Performance Share Units (Details) - USD ($)
$ in Millions
12 Months Ended 35 Months Ended
Oct. 29, 2014
Feb. 14, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Payout Levels (in units):            
Share-based compensation     $ 31.1 $ 40.6 $ 31.5  
Performance share units            
Payout Levels (in units):            
Threshold Award (in shares)     82,298 94,608 76,120  
Target Award (in shares)     164,595 189,215 152,240  
Outstanding Award (in shares)     329,190 378,430 304,480  
Shares Issued in 2015 (in shares)     0 0 54,617  
Shares Subject to Holding Period (in shares)     0 0 46,623  
Percentage of the target award level achieved over the performance period         140.00% 124.00%
Granted (in shares) 3,046 7,610        
Share-based compensation     $ 17.1 $ 20.1 $ 13.1  
Performance share units | February 11, 2014 and May 1, 2014            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       100.00%    
Performance share units | February 11, 2015            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage     100.00%      
Performance share units | December 31, 2014 | February 14, 2013            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage         50.00%  
Performance share units | December 31, 2015 | February 14, 2013            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage         50.00%  
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance period range     1 year      
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance period range     3 years