Income Taxes (Schedule Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Earnings (loss) before income taxes, Domestic	$ 239.3	$ (130.0)	$ 299.7
Earnings (loss) before income taxes, Foreign	3.4	3.3	(0.3)
Earnings (loss) from continuing operations before income taxes	242.7	(126.7)	299.4
Current income tax expense (benefit), Federal	39.4	40.8	31.4
Current income tax expense (benefit), Foreign	0.6	1.0	0.8
Current income tax expense (benefit), State	8.7	5.6	6.3
Current income tax expense (benefit), Total	48.7	47.4	38.5
Deferred income tax expense (benefit), Federal	3.6	(75.5)	15.1
Deferred income tax expense (benefit), Foreign	0.6	0.0	(0.3)
Deferred income tax expense (benefit), State	4.5	(14.5)	3.8
Deferred income tax expense (benefit), Total	8.7	(90.0)	18.6
Tax expense (benefit) at effective rate	$ 57.4	$ (42.6)	$ 57.1