Income Taxes (Schedule Of Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current, U.S. federal tax	$ 31.0	$ 9.3	$ 58.4
Current, state and local tax	2.2	4.9	5.0
Current, Non-U.S. tax	29.0	14.0	29.3
Total current	62.2	28.2	92.7
Deferred, U.S. federal tax	(26.4)	35.7	99.2
Deferred, U.S. state and local tax	3.0	2.0	0.1
Deferred, Non-U.S. tax	(1.7)	10.0	3.0
Total deferred	(25.1)	47.7	102.3
Total provision for income taxes	37.1	75.9	195.0
Excess tax benefits from share-based compensation	$ 3.8	$ 5.4	$ 4.3