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 balance at January 1,	$ 42.6	$ 53.4	$ 86.9
Gross change for current year positions	2.2	3.6	(2.2)
Increases for prior period positions		1.1	2.9
Decrease for prior period positions	(2.1)	(2.0)	(0.1)
Decrease due to statute expirations	(8.0)	(13.5)	(34.1)
Unrecognized tax benefits balance at December 31,	$ 34.7	$ 42.6	$ 53.4