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Derivative Instruments (Narrative) (Details) (Forward Contracts [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Forward Contracts [Member]
   
Derivative [Line Items]    
Maximum maturity period, foreign currency derivative (in days) 90 days  
Gains (losses) on foreign currency forward contracts $ (0.3) $ (1.1)