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Income Taxes (Schedule Of Components Of Income From Continuing Operations Before Income Taxes And Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 509.1	$ 202.4	$ 273.9
Income tax expense (benefit)
Federal - Current	96.0	15.6	18.4
Federal - Deferred	4.7	21.7	31.0
State - Current and deferred	22.3	10.3	10.9
Total	$ 123.0	$ 47.6	$ 60.3

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