Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at January 1	$ 21.8	$ 16.6	$ 13.2
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	8.2	7.4	5.5
Reductions for tax positions of prior years	0.0	0.0	(0.2)
Reductions as a result of a lapse of the statute of limitations	(2.3)	(2.2)	(1.9)
Unrecognized tax benefits at December 31	$ 27.7	$ 21.8	$ 16.6