Stock-Based Compensation, Option Plans (Details) - Stock Options - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Stock-Based Compensation
Total intrinsic value of stock options exercised (in dollars)	$ 504.4	$ 140.3
Total fair value of stock options vested (in dollars)	4.8	$ 2.3
Total compensation cost related to non-vested options not yet recognized (in dollars)	$ 324.4
Weighted average expected amortization period	3 years 3 months 10 days