Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	1,407,700	1,344,600
Award vesting period	3 years
Award expiration period	10 years
Unrecognized compensation cost	$ 371.0
Remaining period over which to recognize unrecognized compensation expense	2 years
Restricted stock units
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	1,155,200	1,083,100
Award vesting period	3 years
Unrecognized compensation cost	$ 651.0
Remaining period over which to recognize unrecognized compensation expense	2 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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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