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Derivative Instruments (Narrative) (Details) (Forward Contracts [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Forward Contracts [Member]
       
Derivative [Line Items]        
Maximum maturity period, foreign currency derivative (in days)     90 days  
Gains (losses) on foreign currency forward contracts $ 1.3 $ (0.3) $ 0.8 $ 0