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Share-Based Compensation - Stock and Status (Details) - Stock options - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Number of Options        
Outstanding at beginning of the period (in shares)     7,317,978  
Granted (in shares)     40,029  
Exercised (in shares) (38,578) (107,233) (279,451) (320,672)
Forfeited/canceled (in shares)     (2,500)  
Outstanding at the end of the period (in shares) 7,076,056   7,076,056  
Exercisable at the end of the period (in shares) 5,687,422   5,687,422  
Unvested at the end of the period (in shares) 1,388,634   1,388,634  
Weighted Average Exercise Price        
Outstanding at beginning of the period (in dollars per share)     $ 126.73  
Granted (in dollars per share)     213.18  
Exercised (in dollars per share)     117.66  
Forfeited (in dollars per share)     130.48  
Outstanding at the end of the period (in dollars per share) $ 127.57   127.57  
Exercisable at the end of the period (in dollars per share) 126.14   126.14  
Unvested at the end of the period (in dollars per share) $ 133.45   $ 133.45  
Weighted Average Remaining Contractual Term (in Years)        
Outstanding at the end of the period (in Years)     3 years 10 months 24 days  
Exercisable at the end of the period (in Years)     3 years 8 months 12 days  
Unvested at the end of the period (in Years)     4 years 8 months 12 days  
Aggregate Intrinsic Value (in millions)        
Outstanding at the end of the period $ 579.6   $ 579.6  
Exercisable at the end of the period 473.5   473.5  
Unvested at the end of the period $ 106.1   $ 106.1  
Weighted average grant date fair value of stock options (in dollars per share)     $ 75.87 $ 56.69
Aggregate grant date fair value     $ 3.0 $ 2.5
Total grant date fair value of employee stock options that vested     $ 16.3 $ 50.3