Stock-Based Compensation, Option Plans (Details) - Stock Options - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Stock-Based Compensation
Total intrinsic value of stock options exercised (in dollars)	$ 761.4	$ 245.8	$ 901.7	$ 461.6
Total fair value of stock options vested (in dollars)	110.6	$ 95.6	112.9	$ 97.9
Total compensation cost related to non-vested options not yet recognized (in dollars)	$ 415.9		$ 415.9
Weighted average expected amortization period			3 years 10 months 2 days