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Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Stock Compensation Plans:
Stock compensation expense	$ 153.0	$ 168.0	$ 367.0	$ 376.0
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	13,800	21,500	1,358,400	4,257,200
Award vesting period			3 years
Award expiration period			10 years
Unrecognized compensation cost	$ 399.0		$ 399.0
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)	13,400	10,300	13,400	10,300
Award vesting period			1 year
Unrecognized compensation cost	$ 3.0		$ 3.0
Remaining period over which to recognize unrecognized compensation expense			10 months
Restricted stock units
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	16,700	21,500	1,099,800	1,535,900
Award vesting period			3 years
Unrecognized compensation cost	$ 580.0		$ 580.0
Remaining period over which to recognize unrecognized compensation expense			2 years

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