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Stockholders’ Equity - Employee Stock Purchase Plan (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Compensation Plans      
Number of shares issued 233,712 157,277 126,648
Stock compensation expense $ 148.2 $ 133.1 $ 96.2
Employee Stock      
Stock Compensation Plans      
Employment period for eligibility to participate in the plan 1 month    
Number of shares issued 233,712 157,277 126,648
Stock compensation expense $ 3.7 $ 3.2 $ 2.4
Remaining shares available 693,521    
Employee Stock | Minimum      
Stock Compensation Plans      
Number of employee working hours per week for eligibility to participate in the plan 20 hours