Nature of Operations and Significant Accounting Policies (Schedule Of Changes To Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Intangible Assets [Roll Forward]
Balance at beginning of period, net of accumulated amortization	$ 467.1	$ 520.3	$ 505.1
Additions	0.0	0.0	52.5
Amortization expense	(41.7)	(44.5)	(48.4)
Currency translation and other	(8.8)	(8.7)	11.1
Balance at end of period, net of accumulated amortization	$ 416.6	$ 467.1	$ 520.3