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Stock-based Compensation Plans (Details)
$ in Millions
3 Months Ended
Feb. 23, 2016
service_period
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation   $ 4.1 $ 2.7
Current Year Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense   1.2  
Prior-Year Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense   2.9  
Restricted Stock Units (RSUs) [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 24,677    
Share-based Compensation Arrangement by Share-based Payment Award, Performance period under adopted ELTI Plan | service_period 3    
Performance Share Units [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 29,633    
Share-based Compensation Arrangement by Share-based Payment Award, Other Award 34 months    
Maximum number of performance share units as percentage of original award (in percent) 250.00%    
RSU and PSU awards [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested compensation expense   $ 7.1  
Restricted Stock [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 | shares   65,000  
Other Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 67,468    
Share-based Compensation Arrangement by Share-based Payment Award, Other Award 3 years    
Unvested compensation expense   $ 8.3