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Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Footnote) (Detail) - USD ($)
$ in Millions
May 31, 2017
Nov. 30, 2016
Banking and Thrift [Abstract]    
Securities borrowing arrangements $ 5,793.7 $ 6,337.5
Securities borrowing arrangements, collateral 5,620.1 6,146.0
Securities borrowing arrangements, repurchase agreements 1,396.9 810.4
Securities borrowing arrangements, repurchase agreements, pledged securities collateral $ 1,438.0 $ 834.2