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Common Stock Repurchases (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	May 31, 2012	May 31, 2011
Common Stock Repurchases [Abstract]
Authorized amount for share repurchase programs	$ 350.0
Common stock purchased and retired, shares		2,193,000
Common stock purchased and retired, value		$ 64.9

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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