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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Derivative [Line Items]
Maximum maturity period foreign currency derivative (in days)	90	90	90
Forward Contracts [Member]
Derivative [Line Items]
Gains (losses) on foreign currency option contracts	$ (1.2)	$ (7.2)	$ 4.2
Options Held [Member]
Derivative [Line Items]
Foreign currency option contracts expiration term (years)	one
Gains (losses) on foreign currency option contracts	$ (0.5)	$ 3.1	$ (1.4)

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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