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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) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivatives Not Designated as Hedging under GAAP        
Derivative Instruments, Gain (Loss) [Line Items]        
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME $ 70.1 $ 62.8 $ 216.1 $ 233.1
Non-Designated Risk Management Derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME (3.9) (1.1) (13.0) (7.2)
Non-Designated Risk Management Derivatives | Foreign Exchange Contracts | Other Operating Income        
Derivative Instruments, Gain (Loss) [Line Items]        
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME (0.3) 4.2 2.7 3.8
Non-Designated Risk Management Derivatives | Other Financial Derivatives | Other Operating Income        
Derivative Instruments, Gain (Loss) [Line Items]        
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME (3.6) (5.3) (15.7) (11.0)
Client-Related and Trading Derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME 74.0 63.9 229.1 240.3
Client-Related and Trading Derivatives | Foreign Exchange Contracts | Foreign Exchange Trading Income        
Derivative Instruments, Gain (Loss) [Line Items]        
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME 66.4 61.6 215.7 221.8
Client-Related and Trading Derivatives | Interest Rate Contracts | Security Commissions and Trading Income        
Derivative Instruments, Gain (Loss) [Line Items]        
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME $ 7.6 $ 2.3 $ 13.4 $ 18.5