Stock-Based Compensation, Stock-based Comp Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock-Based Compensation
Expense incurred for stock-based compensation plans	$ 26.9	$ 23.6	$ 72.4	$ 64.2
Recognized tax benefit related to stock-based compensation	41.0	12.9	74.5	28.3
Excess tax benefit from option exercises	$ 38.3	$ 10.6	$ 67.3	$ 21.9