Share-Based Compensation - Stock and Status (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Options
Exercised (in shares)	(405,536)	(466,731)	(191,508)
Stock options
Number of Options
Outstanding at beginning of year (in shares)	7,680,194
Granted (in shares)	43,653
Exercised (in shares)	(405,536)
Forfeited/canceled (in shares)	(333)
Outstanding at the end of year (in shares)	7,317,978	7,680,194
Exercisable at the end of year (in shares)	5,592,698
Unvested at the end of year (in shares)	1,725,280
Weighted Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 126.27
Granted (in dollars per share)	177.33
Exercised (in dollars per share)	123.47
Forfeited (in dollars per share)	146.03
Outstanding at the end of year (in dollars per share)	126.73	$ 126.27
Exercisable at the end of year (in dollars per share)	125.92
Unvested at the end of year (in dollars per share)	$ 129.34
Weighted Average Remaining Contractual Term (in Years)
Outstanding at the end of year (in Years)	4 years 7 months 6 days
Exercisable at the end of year (in Years)	4 years 4 months 24 days
Unvested at the end of year (in Years)	5 years 3 months 18 days
Aggregate Intrinsic Value
Outstanding at the end of year	$ 653.9
Exercisable at the end of year	504.2
Unvested at the end of year	$ 149.7
Weighted average grant date fair value of stock options (in dollars per share)	$ 56.69	$ 34.56	$ 39.63
Total grant date fair value of employee stock options that vested	$ 50.4	$ 73.5	$ 37.4