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Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Stock Compensation Plans:
Stock compensation expense	$ 146.0	$ 164.0	$ 513.0	$ 540.0
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	16,900	9,500	1,375,300	4,266,700
Award vesting period			3 years
Award expiration period			10 years
Unrecognized compensation cost	$ 335.0		$ 335.0
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	13,400	10,300
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)	14,100	10,900	1,113,900	1,546,800
Award vesting period			3 years
Unrecognized compensation cost	$ 484.0		$ 484.0
Remaining period over which to recognize unrecognized compensation expense			2 years

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