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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
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   $ 0.2 $ 0.0 $ 0.4 $ 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  
Incremental compensation cost $ 0.1        
Impact to additional paid-in capital $ 0.9        
Performance share units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Service period       3 years