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Stock-Based Compensation - Options (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Number of Shares    
Beginning Balance (in shares)   2,840
Granted (in shares)   760
Exercised (in shares)   (1,200)
Forfeited (in shares)   (90)
Ending balance (in shares) 2,310 2,310
Options exercisable (in shares) 1,500 1,500
Weighted- Average Grant Date Fair Value    
Beginning balance (dollars per share) | $ / shares   $ 24.18
Granted (dollars per share) | $ / shares   62.80
Exercised (dollars per share) | $ / shares   13.98
Forfeited (dollars per share) | $ / shares   57.21
Ending balance (dollars per share) | $ / shares $ 40.72 40.72
Options exercisable (dollars per share) | $ / shares $ 29.57 $ 29.57
Ending balance weighted average remaining contractual term (in years)   6 years 6 months 11 days
Options exercisable weighted average remaining contractual term (in years)   4 years 11 months 12 days
Ending balance aggregate intrinsic value | $ $ 67.5 $ 67.5
Options exercisable aggregate intrinsic value | $ 62.8 62.8
Total intrinsic value of options exercised | $ $ 17.3 $ 59.2