Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at January 1	$ 38.7	$ 31.9	$ 27.7
Additions for tax positions of the current year	10.0	10.2	6.7
Additions for tax positions of prior years	0.0	0.0	0.3
Reductions for tax positions of prior years	0.0	0.0	(0.4)
Settlements	2.3	0.0	0.0
Reductions as a result of a lapse of the statute of limitations	(4.7)	(3.4)	(2.4)
Unrecognized tax benefits at December 31	$ 41.7	$ 38.7	$ 31.9