Nature of Operations and Significant Accounting Policies (Schedule Of Changes To Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets [Roll Forward]
Balance at beginning of period, net of accumulated amortization	$ 519.1	$ 503.7	$ 478.3
Additions	0.0	52.5	66.0
Amortization expense	(44.5)	(48.3)	(37.8)
Currency translation and other	(8.7)	11.2	(2.8)
Balance at end of period, net of accumulated amortization	$ 465.9	$ 519.1	$ 503.7