Derivative Financial Instruments (Fair Value Of Derivative Instruments In Balance Sheets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivatives, Fair Value
Derivative assets	$ 333.6		$ 333.6		$ 141.4
Derivative liabilities	315.9		315.9		194.0
Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	0.0		0.0		4.3
Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative liabilities	0.0		0.0		4.3
Derivatives Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	312.7		312.7		129.1
Derivative liabilities	281.4		281.4		173.0
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	289.8		289.8		94.3
Derivative liabilities	245.8		245.8		125.0
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	22.9		22.9		34.8
Derivative liabilities	35.6		35.6		48.0
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	20.9		20.9		8.0
Derivative liabilities	34.5		34.5		16.7
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	20.9		20.9		7.6
Derivative liabilities	34.4		34.4		16.3
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Long Term Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	0.0		0.0		0.4
Derivative liabilities	0.1		0.1		$ 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	54.1	$ (47.0)	(17.5)	$ (44.0)
Selling, General and Administrative Expenses [Member] | Cash Flow Hedging | Foreign exchange contracts
Derivatives, Fair Value
Total hedge gain (loss) recognized in income	$ 0.1		$ (0.4)	$ 0.1