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
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Document Fiscal Year Focus	2018
Gains and Losses on Derivatives | Net Investment Hedging | Foreign currency borrowings and forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in AOCE (Net of Tax) on Derivative (Effective Portion)	$ (59.2)	$ (9.9)