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Derivative Instruments (Details 1) (Foreign Exchange Contract [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue [Member]
       
Summary of the effect of derivatives designated as hedging instruments on the consolidated statements of income        
Amount Reclassified from Accumulated Other Comprehensive Income into Income Gain/(Loss) (Effective Portion) $ (7.3) $ 12.0 $ (6.1) $ 31.0
Other income (expense) [Member]
       
Summary of the effect of derivatives designated as hedging instruments on the consolidated statements of income        
Net gains (losses) in earnings of Foreign currency forward contracts due to hedge ineffectiveness $ (0.1) $ 0.8 $ 0.2 $ 4.0