Stock-Based Compensation, Option Plans (Details) - Stock Options - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Stock-Based Compensation
Total intrinsic value of stock options exercised (in dollars)	$ 190.7	$ 208.4	$ 652.3	$ 447.9
Total fair value of stock options vested (in dollars)	0.9	$ 0.7	98.8	$ 89.3
Total compensation cost related to non-vested options not yet recognized (in dollars)	$ 313.8		$ 313.8
Weighted average expected amortization period			3 years 6 months 25 days