Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Stock Compensation Plans:
Stock compensation expense	$ 214.0	$ 208.0
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	1,344,600	4,235,700
Award vesting period	3 years
Award expiration period	10 years
Unrecognized compensation cost	$ 469.0
Remaining period over which to recognize unrecognized compensation expense	3 years
Restricted stock
Stock Compensation Plans:
Award vesting period	1 year
Unrecognized compensation cost	$ 0.2
Remaining period over which to recognize unrecognized compensation expense	1 month
Restricted stock units
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	1,083,100	1,514,400
Award vesting period	3 years
Unrecognized compensation cost	$ 688.0
Remaining period over which to recognize unrecognized compensation expense	2 years

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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