Income Taxes (Schedule Of The Reconciliation To U.S. Statutory Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Continuing operations tax expense at statutory rate	$ 62.6	$ 54.1	$ 51.0
Increase (decrease) in valuation allowances on deferred income tax assets	0.3	(1.7)	(17.8)
Expiration of deferred income tax assets	0.2	0.7	18.3
State income tax expense, net of federal impact	13.7	11.0	11.0
Statute closures	(0.6)	(5.1)	(3.8)
Excess tax benefits on share-based compensation	(0.1)	(0.5)	(0.8)
U.S. permanent differences	(2.6)	(0.8)	(1.3)
Other	1.0	0.0	0.8
Tax expense at effective rate	$ 74.5	$ 57.7	$ 57.4