Derivative Financial Instruments (Fair Value Of Derivative Instruments In Statement Of Financial Position) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value
Derivative assets	$ 210.0	$ 238.0
Derivative liabilities	166.0	410.7
Derivatives Designated As Hedging Instruments | Foreign Exchange Contract
Derivatives, Fair Value
Derivative assets	143.2	57.9
Derivative liabilities	88.7	230.6
Derivatives Designated As Hedging Instruments | Foreign Exchange Contract | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	109.7	47.2
Derivative liabilities	83.9	183.0
Derivatives Designated As Hedging Instruments | Foreign Exchange Contract | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	33.5	10.7
Derivative liabilities	4.8	47.6
Derivatives Not Designated As Hedging Instruments | Foreign Exchange Contract
Derivatives, Fair Value
Derivative assets	19.5
Derivative liabilities	30.0
Derivatives Not Designated As Hedging Instruments | Foreign Exchange Contract | Current - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	16.2
Derivative liabilities	22.4
Derivatives Not Designated As Hedging Instruments | Foreign Exchange Contract | Long-Term - Derivative Financial Instruments
Derivatives, Fair Value
Derivative assets	3.3
Derivative liabilities	7.6
Derivatives Not Designated As Hedging Instruments | Long-term – Derivative financial instruments – Synthetic Bonds – Call Option Premium
Derivatives, Fair Value
Derivative assets	47.3	180.1
Derivatives Not Designated As Hedging Instruments | Long-term – Derivative financial instruments – Synthetic Bonds – Embedded Derivatives
Derivatives, Fair Value
Derivative liabilities	$ 47.3	$ 180.1