Income Taxes (Schedule Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Earnings (loss) before income taxes, Domestic	$ 224.1	$ 147.8	$ 92.7
Earnings (loss) before income taxes, Foreign	(2.0)	2.8	1.9
Earnings from continuing operations before income taxes	222.1	150.6	94.6
Current income tax expense (benefit), Federal	26.2	15.1	16.8
Current income tax expense (benefit), Foreign	1.4	5.0	2.8
Current income tax expense (benefit), State	4.7	(6.7)	(4.8)
Current income tax expense (benefit), Total	32.3	13.4	14.8
Deferred income tax expense (benefit), Federal	(36.6)	22.6	12.7
Deferred income tax expense (benefit), Foreign	(0.1)	(1.1)	(1.2)
Deferred income tax expense (benefit), State	5.9	16.4	10.4
Deferred income tax expense (benefit), Total	(30.8)	37.9	21.9
Income tax expense (benefit)	$ 1.5	$ 51.3	$ 36.7