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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Schedule of Realized Gains/Losses on Derivative Contracts (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Commodities        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative instruments, gain (loss) recognized in income, net $ 89.2 $ 189.6 $ 275.2 $ 320.3
Foreign exchange        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative instruments, gain (loss) recognized in income, net 39.3 29.8 106.4 87.6
Interest rate, equities, and indices        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative instruments, gain (loss) recognized in income, net 33.5 27.1 83.4 70.0
To be announced and forward settling securities        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative instruments, gain (loss) recognized in income, net 22.5 8.7 41.3 (59.0)
Derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative instruments, gain (loss) recognized in income, net $ 184.5 $ 255.2 $ 506.3 $ 418.9