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Stock-Based Compensation (Additional Information) (Details)
$ in Millions
3 Months Ended 6 Months Ended 51 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
offering_periods
Jun. 30, 2015
USD ($)
Jun. 30, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options     $ 2.1    
Deferred Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense (income) $ 0.7 $ 0.7 $ 0.7 $ 0.7  
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, contractual term (years)     10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares         0
Stock-based compensation, approximate forfeitures rate (percent)     3.00%    
Compensation expense (income) 0.0 0.1 $ 0.0 0.1  
Options exercised, total intrinsic value     $ 1.4    
Performance-Based Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation, approximate forfeitures rate (percent)     12.00%    
Compensation expense (income) 1.4 1.2 $ 2.1 1.6  
Restricted stock award program, measurement period (years)     3 years    
Expected dividend yield (percent)     0.00%    
Performance-Based Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)     0.00%    
Performance-Based Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)     200.00%    
Time Based Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation, approximate forfeitures rate (percent)     12.00%    
Compensation expense (income) 1.5 1.3 $ 2.7 2.4  
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense (income) $ 0.1 $ 0.1 $ 0.2 $ 0.2  
Employee stock purchase plan, number of offering (offering period) | offering_periods     2    
Employee stock purchase plan, offering period (months)     6 months    
Employee stock purchase plan, purchase price discount (percent)     15.00%