Stock-Based Compensation, Option Plans (Details) - Employee Stock Option [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock-Based Compensation
Total intrinsic value of stock options exercised (in dollars)	$ 208.4	$ 82.2	$ 447.9	$ 151.4
Total fair value of stock options vested (in dollars)	0.7	$ 0.7	89.3	$ 79.4
Total compensation cost related to non-vested options not yet recognized (in dollars)	$ 273.0		$ 273.0
Weighted average expected amortization period			3 years 6 months 14 days