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Securitization Activities - Activity Related to Securitizations Accounted for as Sales (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
May 31, 2013
Successor [Member]
Feb. 28, 2013
Predecessor [Member]
May 31, 2012
Predecessor [Member]
May 31, 2012
Predecessor [Member]
Securitization Vehicles [Line Items]        
Transferred assets $ 2,184.0 $ 2,735.2 $ 2,901.8 $ 4,938.6
Proceeds on new securitizations 2,190.9 2,751.3 3,232.2 5,279.1
Net revenues 4.8 12.9 6.1 14.1
Cash flows received on retained interests $ 11.1 $ 32.3 $ 9.1 $ 24.9