Derivative Financial Instruments (Fair Value Of Derivative Instruments In Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value
Derivative assets	$ 168.5	$ 173.2
Derivative liabilities	186.2	137.1
Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	76.3	62.2
Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative liabilities	76.3	62.2
Derivatives Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	80.0	93.6
Derivative liabilities	98.1	52.7
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	72.2	65.6
Derivative liabilities	86.1	51.0
Derivatives Designated As Hedging Instruments | Foreign exchange contracts | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	7.8	28.0
Derivative liabilities	12.0	1.7
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts
Derivatives, Fair Value
Derivative assets	12.2	17.4
Derivative liabilities	11.8	22.2
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	11.7	12.7
Derivative liabilities	11.8	18.0
Derivatives Not Designated As Hedging Instruments | Foreign exchange contracts | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	$ 0.5	4.7
Derivative liabilities		$ 4.2