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Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock Compensation Plans:
Stock compensation expense	$ 98.0	$ 83.0	$ 332.0	$ 263.0
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	36,900	17,100	1,278,700	1,282,400
Award vesting period			3 years
Award expiration period			10 years
Unrecognized compensation cost	$ 272.0		$ 272.0
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	4,600	6,000
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)	8,900	5,000	363,100	420,900
Award vesting period			3 years
Unrecognized compensation cost	$ 257.0		$ 257.0
Remaining period over which to recognize unrecognized compensation expense			2 years

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