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Stock-Based Compensation - Narrative (Details) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
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 $ 28.1
Compensation cost not yet recognized, period for recognition 2 years 5 months 5 days
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation cost not yet recognized, period for recognition 2 years 1 month 24 days
Compensation not yet recognized, stock options $ 0.5