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, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 20.6	$ 19.6	$ (46.6)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	20.6	16.6	(46.6)
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	$ 3.0	$ 0.0