Income Taxes (Schedule Of Gross Unrecognized Tax Benefits Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance of liability as of January 1,	$ 31.6	$ 34.0	$ 39.8	$ 42.0
Increase as a result of tax positions taken during a prior year	0.7	5.4	1.1
Decrease as a result of tax positions taken during a prior year	(0.3)	(0.4)	(0.5)
Increase as a result of tax positions taken during the current year	2.6	1.8	3.2
Decrease as a result of settlements with taxing authorities	(0.8)	(2.5)	0.0
Reduction as a result of a lapse of the statute of limitations	(4.6)	(10.1)	(6.0)
Balance of liability as of December 31,	$ 31.6	$ 34.0	$ 39.8	$ 42.0