Nature of Operations and Significant Accounting Policies (Schedule Of Changes To Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Intangible assets, net	$ 505.1	$ 481.8	$ 276.8	$ 282.2
Indefinite-lived Intangible Assets Acquired	66.0	252.8	18.2
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	40.9
Amortization expense	(40.0)	(44.5)	(30.9)
Finite-Lived Intangible Assets, Translation Adjustments	(2.7)	(3.3)	$ 7.3
Balance at end of period, net of accumulated amortization	505.1	481.8
Finite-Lived Intangible Assets, Amortization Expense, Year Two	38.4
Finite-Lived Intangible Assets, Amortization Expense, Year Three	38.1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	38.1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	279.7
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 69.9	$ 69.9