Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 104.0	$ 72.0	$ 61.7
State	21.6	17.0	14.1
Foreign	7.8	13.4	4.8
Total current	133.4	102.4	80.6
Deferred:
Federal	(13.9)	(2.6)	(0.7)
State	(3.1)	(1.5)	1.1
Foreign	2.3	(2.2)	7.1
Total deferred	(14.7)	(6.3)	7.5
Total provision for income taxes	$ 118.7	$ 96.1	$ 88.1