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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Schedule of Net Gains/(Losses) from Derivative Contracts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of sales of physical commodities, Total revenues Cost of sales of physical commodities, Total revenues Cost of sales of physical commodities, Total revenues
Derivative Instruments, Gain (Loss) [Line Items]      
Net gains from derivative contracts $ 584.5 $ 473.1 $ 897.7
Commodities      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gains from derivative contracts 360.5 383.8 446.5
Foreign exchange      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gains from derivative contracts 119.1 124.6 269.2
Interest rate, equities, and indices      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gains from derivative contracts 104.3 100.2 109.0
To be announced and forward settling securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gains from derivative contracts $ 0.6 $ (135.5) $ 73.0