Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Footnote) (Detail) - USD ($) $ in Millions	Nov. 30, 2016	Nov. 30, 2015
Banking and Thrift [Abstract]
Securities borrowing arrangements	$ 6,337.5	$ 5,796.1
Securities borrowing arrangements, collateral	6,146.0	5,613.3
Securities borrowing arrangements, repurchase agreements	810.4	1,807.2
Securities borrowing arrangements, pledged securities collateral	$ 834.2	$ 1,875.3