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Stock-Based Compensation - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation not yet recognized, share-based awards other than options $ 24.1
Compensation cost not yet recognized, period for recognition 2 years 2 months 5 days
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation cost not yet recognized, period for recognition 1 year 10 months 8 days
Compensation not yet recognized, stock options $ 0.4