Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Footnote) (Detail) - USD ($) $ in Millions	Feb. 29, 2016	Nov. 30, 2015
Banking and Thrift [Abstract]
Securities borrowing arrangements	$ 6,158.2	$ 5,796.1
Securities borrowing arrangements, collateral	5,970.0	5,613.3
Securities borrowing arrangements, repurchase agreements	1,767.0	1,807.2
Securities borrowing arrangements, pledged securities collateral	$ 1,823.3	$ 1,875.3