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Acquisitions - R.J. O’Brien - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Apr. 14, 2025
Business Combination [Line Items]          
Total revenues   $ 132,378.2 $ 99,887.8 $ 60,856.1  
Net income   305.9 $ 260.8 $ 238.5  
RJO          
Business Combination [Line Items]          
Percentage of stock purchased         100.00%
Stock issued for acquisition (in shares) 3,085,554        
Expected price of acquisition, equity issuable target value $ 275.0        
Total revenues   141.0      
Net income   14.7      
Business acquisition, cost incurred related to merger   $ 10.1      
Business Combination, Separately Recognized Transaction, Acquisition-Related Cost, Expensed, Statement of Income or Comprehensive Income [Extensible Enumeration]   Professional fees