Income Taxes (Schedule Of Gross Unrecognized Tax Benefits Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance of liability as of January 1,	$ 28.2	$ 31.6	$ 34.0	$ 39.8
Increase as a result of tax positions taken during a prior year	0.0	0.7	5.4
Decrease as a result of tax positions taken during a prior year	(0.6)	(0.3)	(0.4)
Increase as a result of tax positions taken during the current year	3.1	2.6	1.8
Decrease as a result of settlements with taxing authorities	0.0	(0.8)	(2.5)
Reduction as a result of a lapse of the statute of limitations	(5.9)	(4.6)	(10.1)
Balance of liability as of December 31,	$ 28.2	$ 31.6	$ 34.0	$ 39.8