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Equity Incentive Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options, Outstanding, Number, Beginning 1,374,705  
Options, Grants in Period, Net of Forfeitures 92,992  
Options, Exercises in Period (250,520)  
Options, Forfeitures in Period (1,696)  
Options, Outstanding, Number, Ending 1,215,481  
Options, Exercisable, Number 888,061  
Aggregate Intrinsic Value [Abstract]    
Options, Outstanding, Intrinsic Value $ 274.6 $ 243.1
Options, Exercisable, Intrinsic Value $ 236.5  
Weighted Average Exercise Price [Abstract]    
Options, Outstanding, Weighted Average Exercise Price, Beginning $ 162.29  
Options, Grants in Period, Weighted Average Exercise Price 397.95  
Options, Exercises in Period, Weighted Average Exercise Price 101.67  
Options, Forfeitures in Period, Weighted Average Exercise Price 294.14  
Options, Outstanding, Weighted Average Exercise Price, Ending 192.63  
Options, Exercisable, Weighted Average Exercise Price $ 152.23