Common Stock Repurchases (Details) (USD $) Share data in Millions, unless otherwise specified	9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Common Stock Repurchases [Abstract]
Common stock repurchased and retired (in shares)	2.3	10.3
Common stock repurchased and retired	$ 52,600,000	$ 237,400,000
Authorized amount for share repurchase programs	$ 100,000,000	$ 360,000,000