Financial Instruments and Risk Management (Effect of Derivative Instruments on the Consolidated Statements of Comprehensive Earnings Derivatives in Cash Flow Hedging Relationships) (Details) - Cash flow hedging relationships - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (46.6)	$ 28.1	$ (66.2)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(46.6)	28.1	(27.5)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 0.0	$ 0.0	$ (38.7)