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Derivative Instruments and Hedging Activities (Details 2) (Foreign exchange derivative instruments [Member], Derivatives Not Designated as Hedging Instruments [Member], Other, net [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Foreign exchange derivative instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other, net [Member]
       
Changes in fair value of foreign exchange contracts        
Amount of Gain or (Loss) Recognized in Income on Derivatives $ 0.7 $ (0.2) $ 0.3 $ (1.3)