Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ 158.0	$ 131.8	$ 104.0
State	33.5	26.6	21.6
Foreign	20.0	14.5	7.8
Total current	211.5	172.9	133.4
Deferred:
Federal	(19.6)	(22.2)	(13.9)
State	(4.0)	(4.9)	(3.1)
Foreign	(1.0)	1.6	2.3
Total deferred	(24.6)	(25.5)	(14.7)
Total provision for income taxes	$ 186.9	$ 147.4	$ 118.7