Income Taxes (Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 143.8	$ 270.6	$ 223.9
State	38.8	33.2	28.2
Foreign	24.1	20.5	12.6
Income tax expense	206.7	324.3	264.7
Deferred
Federal	27.4	(33.1)	23.2
State	0.2	3.3	1.2
Foreign	0.8	0.0	1.2
Income tax expense	28.4	(29.8)	25.6
Total
Federal	171.2	237.5	247.1
State	39.0	36.5	29.4
Foreign	24.9	20.5	13.8
Income tax expense	$ 235.1	$ 294.5	$ 290.3