Income Taxes (Schedule Of Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current, U.S. federal tax	$ 11.3	$ 31.0	$ 9.3
Current, state and local tax	1.6	2.2	4.9
Current, Non-U.S. tax	12.4	29.0	14.0
Total current	25.3	62.2	28.2
Deferred, U.S. federal tax	16.5	(26.4)	35.7
Deferred, U.S. state and local tax	(0.1)	3.0	2.0
Deferred, Non-U.S. tax	1.7	(1.7)	10.0
Total deferred	18.1	(25.1)	47.7
Total provision for income taxes	43.4	37.1	75.9
Excess tax benefits from share-based compensation	$ 0.6	$ 3.8	$ 5.4