Income Taxes Components of Income Tax Provision From Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 245.6	$ 368.7	$ 374.2
State	64.9	87.4	78.5
Federal and state deferred	19.0	0.8	(17.2)
Change in valuation allowance, net	1.0	0.2	(0.2)
Adjustments and settlements	(0.5)	(1.3)	(0.2)
Income tax provision	$ 330.0	$ 455.8	$ 435.1