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Income Taxes (Difference In Income Tax Expense And Expected Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	21.00%	21.00%	35.00%
U.S. federal income tax expense at statutory rate	$ 219.2	$ 207.3	$ 305.6
State income taxes, net of federal benefit	32.8	30.2	21.5
Transition tax	0.0	1.2	6.5
Remeasurement of deferred taxes for Tax Act	0.0	(11.5)	(30.8)
Other, net	0.8	7.9	(8.3)
Income tax expense	$ 252.8	$ 235.1	$ 294.5
Effective income tax rate	24.20%	23.80%	33.70%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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