Nature Of Operations And Significant Accounting Policies (Schedule Of Changes To Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Indefinite-lived Intangible Assets Acquired	$ 18.2	$ 0.0	$ 0.0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	28.9
Balance at beginning of period, net of accumulated amortization	282.2	317.1	353.5
Amortization expense	(30.9)	(30.7)	(31.5)
Finite-Lived Intangible Assets, Translation Adjustments	7.3	(4.2)	(4.9)
Balance at end of period, net of accumulated amortization	276.8	$ 282.2	$ 317.1
Finite-Lived Intangible Assets, Amortization Expense, Year Two	26.2
Finite-Lived Intangible Assets, Amortization Expense, Year Three	22.0
Finite-Lived Intangible Assets, Amortization Expense, Year Four	19.6
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 151.4