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Stock-Based Compensation - Narrative (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value of options exercised during period $ 4.5
Intrinsic value of options outstanding 89.1
Total unrecognized compensation cost 20.7
Weighted-average recognition period for unrecognized compensation cost 2 years 10 months 5 days
Restricted stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value of stock vested during period 2.7
Intrinsic value of restricted stock units outstanding $ 20.4