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Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock Compensation Plans:      
Stock compensation expense $ 430.0 $ 351.0 $ 315.0
Roll Forward of Stock Options Outstanding:      
Stock options outstanding, beginning of period (in shares) 8,842,000 10,549,000 10,410,000
Stock options granted (in shares) 1,295,000 1,672,000 1,847,000
Stock options exercised (in shares) (1,568,000) (3,160,000) (1,271,000)
Stock options canceled (in shares) (136,000) (219,000) (437,000)
Stock options outstanding, end of period (in shares) 8,433,000 8,842,000 10,549,000
Stock options outstanding weighted average exercise price, beginning of period $ 312.95 $ 241.14 $ 225.53
Stock options granted weighted average exercise price 629.57 536.27 298.84
Stock options exercised weighted average exercise price 295.46 191.43 186.90
Stock options canceled weighted average exercise price 476.90 312.94 270.94
Stock options outstanding weighted average exercise price, end of period $ 362.26 $ 312.95 $ 241.14
Stock options exercised aggregate intrinsic value $ 606.0 $ 1,176.0 $ 247.0
Stock options outstanding aggregate intrinsic value $ 2,447.0    
Stock options outstanding weighted average remaining contractual life (in years) 6 years 7 years 7 years
Stock options exercisable, end of period (in shares) 4,102,000 2,940,000 3,119,000
Stock options exercisable weighted average exercise price, end of period $ 237.45 $ 220.78 $ 161.13
Stock options exercisable aggregate intrinsic value, end of period $ 1,700.0    
Stock options expected to vest, end of period (in shares) 4,331,000    
Stock options expected to vest weighted average exercise price, end of period $ 480.47    
Stock options expected to vest aggregate intrinsic value, end of period $ 746.0    
Stock options granted weighted average grant date fair value $ 171.21 $ 148.02 $ 84.39
Stock Options      
Stock Compensation Plans:      
Award vesting period (in years) 3 years    
Award expiration period (in years) 10 years    
Unrecognized compensation expense $ 226.0    
Remaining period over which unrecognized compensation expense is expected to be recognized (in years) 2 years    
Restricted Stock      
Stock Compensation Plans:      
Award vesting period (in years) 1 year    
Unrecognized compensation expense $ 1.0    
Remaining period over which unrecognized compensation expense is expected to be recognized (in years) 4 months    
Roll Forward of Restricted Stock and Restricted Stock Units Outstanding:      
Awards other than stock options outstanding, beginning of period (in shares) 6,000 8,000 10,000
Awards other than stock options, granted (in shares) 5,000 6,000 8,000
Awards other than stock options, vested (in shares) (6,000) (8,000) (10,000)
Awards other than stock options, canceled (in shares) 0 0 0
Awards other than stock options outstanding, end of period (in shares) 5,000 6,000 8,000
Awards other than stock options outstanding weighted average grant price, beginning of period $ 504.53 $ 359.33 $ 297.86
Awards other than stock options granted weighted average grant price 654.33 504.53 359.33
Awards other than stock options vested weighted average grant price 504.53 359.33 297.86
Awards other than stock options canceled weighted average grant price 0 0 0
Awards other than stock options outstanding weighted average grant price, end of period $ 654.33 $ 504.53 $ 359.33
Restricted Stock Units (RSUs)      
Stock Compensation Plans:      
Award vesting period (in years) 3 years    
Unrecognized compensation expense $ 208.0    
Remaining period over which unrecognized compensation expense is expected to be recognized (in years) 2 years    
Roll Forward of Restricted Stock and Restricted Stock Units Outstanding:      
Awards other than stock options outstanding, beginning of period (in shares) 1,651,000 2,059,000 2,211,000
Awards other than stock options, granted (in shares) 367,000 423,000 704,000
Awards other than stock options, vested (in shares) (665,000) (753,000) (729,000)
Awards other than stock options, canceled (in shares) (59,000) (78,000) (127,000)
Awards other than stock options outstanding, end of period (in shares) 1,294,000 1,651,000 2,059,000
Awards other than stock options outstanding weighted average grant price, beginning of period $ 337.82 $ 249.45 $ 219.61
Awards other than stock options granted weighted average grant price 629.47 509.64 298.22
Awards other than stock options vested weighted average grant price 269.88 194.40 206.88
Awards other than stock options canceled weighted average grant price 467.26 317.45 250.85
Awards other than stock options outstanding weighted average grant price, end of period $ 449.03 $ 337.82 $ 249.45
Class A Common Stock      
Stock Compensation Plans:      
Shares authorized under the the stock incentive plan (in shares) 16,000,000    
Roll Forward of Stock Options Outstanding:      
Stock options exercised (in shares) (1,568,488) (3,160,065) (1,271,419)
Roll Forward of Restricted Stock and Restricted Stock Units Outstanding:      
Awards other than stock options, vested (in shares) (664,771) (753,139) (728,553)