Financial Instruments and Risk Management (Effect Of Derivative Instruments on the Condensed Consolidated Statements of Operations, Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Document Fiscal Year Focus			2018
Amount of Gain (Loss) Recognized in Earnings on Derivatives	$ (25.1)	$ (43.0)	$ 2.5	$ (60.1)
Foreign currency forward contracts | Other expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	$ (25.1)	$ (43.0)	$ 2.5	$ (60.1)