Income Taxes (Income Tax Components) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 34.8	$ 44.4	$ 43.6
State	11.8	15.8	15.5
Foreign	5.0	4.9	3.0
Total Current	51.6	65.1	62.1
Deferred:
Federal and State	28.5	31.6	19.5
Foreign	(1.7)	0.0	0.0
Total Deferred	26.8	31.6	19.5
Total	$ 78.4	$ 96.7	$ 81.6