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Derivative Financial Instruments - Location and Amount of Gains and Losses Recorded in Income for Derivatives not Designated as Hedging Under GAAP (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Non-designated risk management derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gains (losses) from derivatives not designated as hedging under GAAP $ (11.9) $ (21.6) $ (23.3)
Client-related and trading derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gains (losses) from derivatives not designated as hedging under GAAP 312.8 263.8 314.9
Total Derivatives Not Designated as Hedging under GAAP      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gains (losses) from derivatives not designated as hedging under GAAP 300.9 242.2 291.6
Foreign Exchange Contracts | Other Operating Income | Non-designated risk management derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gains (losses) from derivatives not designated as hedging under GAAP 6.4 (1.6) (4.1)
Foreign Exchange Contracts | Foreign Exchange Trading Income | Client-related and trading derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gains (losses) from derivatives not designated as hedging under GAAP 290.4 250.9 307.2
Other Financial Derivatives | Other Operating Income | Non-designated risk management derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gains (losses) from derivatives not designated as hedging under GAAP (18.3) (20.0) (19.2)
Interest Rate Contracts | Security Commissions and Trading Income | Client-related and trading derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gains (losses) from derivatives not designated as hedging under GAAP $ 22.4 $ 12.9 $ 7.7