Financial Instruments and Risk Management Financial Instruments and Risk Management (Effect Of Derivative Instruments on the Condensed Consolidated Statements of Comprehensive Earnings Derivatives in Cash Flow Hedging Relationships) (Details) (Details) - Cash Flow Hedging - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 29.5	$ (8.4)	$ (0.5)	$ 10.9
Foreign currency forward contracts
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 29.5	$ (8.4)	$ (0.5)	$ 10.9