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Derivative Instruments (Narrative) (Details) (Forward Contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Forward Contracts [Member]
Derivative [Line Items]
Maximum maturity period, foreign currency derivative (in days)	90 days
Losses on foreign currency forward contracts	$ (1.1)	$ (2.2)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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