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Derivative Instruments (Narrative) (Details) (Forward Contracts [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 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 $ 0.6 $ 2.5 $ (0.5) $ 0.3