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Financial Instruments - Effects of Derivative Financial Instruments on Income and Other Comprehensive Income (Loss) (Details) (Foreign Exchange Contract [Member], Not Designated as Hedging Instrument [Member], Foreign Currency Gain (Loss) [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Foreign Currency Gain (Loss) [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Foreign Currency Losses, Net $ 1.8 $ 0.5 $ 2.3 $ (1.1)