Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Footnote) (Detail) - USD ($) $ in Millions	Aug. 31, 2016	Nov. 30, 2015
Banking and Thrift [Abstract]
Securities borrowing arrangements	$ 6,520.3	$ 5,796.1
Securities borrowing arrangements, collateral	6,315.7	5,613.3
Securities borrowing arrangements, repurchase agreements	1,278.2	1,807.2
Securities borrowing arrangements, pledged securities collateral	$ 1,326.2	$ 1,875.3