Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Footnote) (Detail) - USD ($) $ in Millions	Feb. 28, 2017	Nov. 30, 2016
Banking and Thrift [Abstract]
Securities borrowing arrangements	$ 5,695.3	$ 6,337.5
Securities borrowing arrangements, collateral	5,505.2	6,146.0
Securities borrowing arrangements, repurchase agreements	948.0	810.4
Securities borrowing arrangements, repurchase agreements, pledged securities collateral	$ 975.5	$ 834.2