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Derivative Instruments and Risk Management (Details 2) (Not Designated as Hedging Instrument [Member], Foreign currency forward exchange contracts [Member], Other income/(expense) [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Not Designated as Hedging Instrument [Member] | Foreign currency forward exchange contracts [Member] | Other income/(expense) [Member]
     
Summary of foreign currency forward exchange contracts which have not been designated as hedging instruments, and their impact on the income statement      
Amount of Gain/(Loss) Recognized in Income $ 1.2 $ 1.3 $ 0.9