Income Taxes (Schedule Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Earnings (loss) before income taxes, Domestic	$ (130.0)	$ 299.7	$ 234.0
Earnings (loss) before income taxes, Foreign	3.3	(0.3)	8.7
(Loss) earnings from continuing operations before income taxes	(126.7)	299.4	242.7
Current income tax expense (benefit), Federal	40.8	31.4	45.7
Current income tax expense (benefit), Foreign	1.0	0.8	2.1
Current income tax expense (benefit), State	5.6	6.3	8.0
Current income tax expense (benefit), Total	47.4	38.5	55.8
Deferred income tax expense (benefit), Federal	(75.5)	15.1	(3.7)
Deferred income tax expense (benefit), Foreign		(0.3)
Deferred income tax expense (benefit), State	(14.5)	3.8	1.0
Deferred income tax expense (benefit), Total	(90.0)	18.6	(2.7)
Income tax (benefit) expense	$ (42.6)	$ 57.1	$ 53.1