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Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock Compensation Plans:
Stock compensation expense	$ 109.0	$ 98.0	$ 360.0	$ 332.0
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	50,700	36,900	1,455,100	1,278,700
Award vesting period			3 years
Award expiration period			10 years
Unrecognized compensation cost	$ 268.0		$ 268.0
Remaining period over which to recognize unrecognized compensation expense			2 years
Restricted stock
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	0	0	6,800	4,600
Award vesting period			1 year
Unrecognized compensation cost	$ 2.0		$ 2.0
Remaining period over which to recognize unrecognized compensation expense			7 months
Restricted stock units
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	175,600	8,900	618,700	363,100
Award vesting period			3 years
Unrecognized compensation cost	$ 329.0		$ 329.0
Remaining period over which to recognize unrecognized compensation expense			2 years

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