Securitization Activities and Variable Interest Entities (Details 1) (USD $) In Millions	3 Months Ended		8 Months Ended	9 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2010	Aug. 31, 2011	Nov. 30, 2010
Cash inflows related to securitization vehicles
Cash proceeds from Transfer of securitization assets	$ 1,922.7	$ 2,710.7	$ 6,982.0	$ 7,421.1
Securitization Activities and Variable Interest Entities (Textuals) [Abstract]
Liabilities related to these securitization of vehicles	0			0	0
Residential mortgage-backed securities [Member]
Cash inflows related to securitization vehicles
Cash proceeds from Transfer of securitization assets	24.8	11.5	26.3	55.3
Commercial mortgage-backed securities [Member]
Cash inflows related to securitization vehicles
Cash proceeds from Transfer of securitization assets	$ 2.0	$ 0.7	$ 0.9	$ 4.0