Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at January 1	$ 31.9	$ 27.7	$ 21.8
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	10.2	6.7	8.2
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0.0	0.3	0.0
Reductions for tax positions of prior years	0.0	(0.4)	0.0
Reductions as a result of a lapse of the statute of limitations	(3.4)	(2.4)	(2.3)
Unrecognized tax benefits at December 31	$ 38.7	$ 31.9	$ 27.7