Derivative Financial Instruments (Fair Value Of Derivative Instruments In Balance Sheets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivatives, Fair Value
Derivative assets	$ 437.3		$ 141.4
Derivative liabilities	583.8		194.0
Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	0.3		4.3
Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative liabilities	0.3		4.3
Derivatives Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	425.5		129.1
Derivative liabilities	563.5		173.0
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	342.8		94.3
Derivative liabilities	465.8		125.0
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	82.7		34.8
Derivative liabilities	97.7		48.0
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	11.5		8.0
Derivative liabilities	20.0		16.7
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	10.5		7.6
Derivative liabilities	19.8		16.3
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	1.0		0.4
Derivative liabilities	0.2		$ 0.4
Cash Flow Hedging | Foreign exchange contracts
Derivatives, Fair Value
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (112.0)	$ 16.6
Selling, General and Administrative Expenses [Member] | Cash Flow Hedging | Foreign exchange contracts
Derivatives, Fair Value
Total hedge gain (loss) recognized in income		$ 0.1