Financial Instruments and Risk Management (Effect of Derivative Instruments on the Condensed Consolidated Statements of Comprehensive Earnings Derivatives in Net Investment Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gains and Losses on Derivatives | Net Investment Hedging | Foreign currency borrowings and forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 106.2	$ 17.9	$ 126.9	$ 77.7