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Stock Option and Compensation Plans - Stock Incentive Plans and Stock Option Activity Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Jan. 01, 2016
Jan. 01, 2015
Jan. 01, 2014
Apr. 30, 2016
Aug. 31, 2013
Sep. 30, 2016
Options outstanding, net of estimated forfeitures, vested or expected to vest            
Options outstanding (in shares)           3,198,000
Weighted-average exercise price (in dollars per share)           $ 39.42
Weighted average remaining contractual life           7 years 9 months 16 days
Aggregate intrinsic value           $ 35.2
2007 Plan            
Stock Option and Compensation Plans            
Number of shares of common stock available for issuance under the Plan (in shares)         739,317  
2013 Plan            
Stock Option and Compensation Plans            
Number of shares of common stock available for issuance under the Plan (in shares)           1,048,000
Annual increase in shares reserved for issuance under the Plan (in shares)         2,542,372  
Annual increase in shares reserved for issuance under the Plan (as a percent)         4.00%  
Increase in number of shares available under the Plan (in shares) 1,408,000 1,360,000 1,257,000      
2013 Plan | Maximum            
Stock Option and Compensation Plans            
Number of shares reserved for issuance under the Plan (in shares)         3,359,641  
ESPP            
Stock Option and Compensation Plans            
Purchase price of common stock as percentage of fair market value       85.00%    
ESPP | Maximum            
Stock Option and Compensation Plans            
Number of shares reserved for issuance under the Plan (in shares)       1,000,000