Income Taxes Components of Income Tax Provision From Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 374.2	$ 168.9	$ 86.0
State	78.5	37.4	29.4
Federal and state deferred	(17.2)	(39.0)	45.8
Change in valuation allowance, net	(0.2)	0.3	0.2
Adjustments and settlements	(0.2)	0.7	0.4
Income tax provision	$ 435.1	$ 168.3	$ 161.8