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Common Stock Repurchases (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Common Stock Repurchases [Abstract]
Common stock repurchased and retired (in shares)	10,300,000	0
Common stock repurchased and retired	$ 237.4
Authorized amount for share repurchase programs	$ 360.0

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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