Derivative Financial Instruments (Fair Value Of Derivative Instruments In Balance Sheets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivatives, Fair Value
Derivative assets	$ 112.6		$ 114.0
Derivative liabilities	198.9		183.3
Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	12.5		9.2
Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative liabilities	12.5		9.2
Derivatives Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	85.9		92.8
Derivative liabilities	170.9		163.3
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	75.5		83.8
Derivative liabilities	130.4		127.7
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	10.4		9.0
Derivative liabilities	40.5		35.6
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	14.2		12.0
Derivative liabilities	15.5		10.8
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	14.2		11.9
Derivative liabilities	15.5		10.7
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets			0.1
Derivative liabilities			$ 0.1
Cash Flow Hedging | Foreign exchange contracts
Derivatives, Fair Value
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 16.6	$ 14.2