Stock-Based Compensation, Stock-based Comp Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Stock-Based Compensation
Expense incurred for stock-based compensation plans	$ 31.3	$ 26.6	$ 57.9	$ 50.4
Recognized tax benefit related to stock-based compensation	88.7	33.7	111.7	65.8
Excess tax benefit from option exercises	$ 85.3	$ 30.9	$ 105.5	$ 60.6