Stock-Based Compensation, Stock-based Comp Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock-Based Compensation
Expense incurred for stock-based compensation plans	$ 23.6	$ 21.2	$ 64.2	$ 60.2
Recognized tax benefit related to stock-based compensation	12.9	14.0	28.3	40.4
Excess tax benefit from option exercises	$ 10.6	$ 12.3	$ 21.9	$ 34.3