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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Restricted stock awards | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   3 years
Restricted stock awards | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   5 years
Restricted stock units and Stock appreciation rights    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Accrued incentive expense $ 0.0 $ 3.1
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   3 years
Expected term (in years)   5 years
Stock appreciation rights    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   3 years
Expected term (in years)   5 years
Performance share units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term (in years)   3 years
Service period   3 years