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Acquisitions - Benchmark - Narrative (Details)
$ in Millions
 12 Months Ended
Jul. 31, 2025
USD ($)
payment
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Business Combination [Line Items]        
Goodwill   $ 298.3 $ 61.0  
Total revenues   132,378.2 99,887.8 $ 60,856.1
Net income   305.9 $ 260.8 $ 238.5
Benchmark        
Business Combination [Line Items]        
Purchase price $ 57.1      
Number of contingent annual future payments | payment 4      
Contingent consideration, maximum amount $ 7.0      
Annual caps period 4 years      
Holdback amount $ 25.3      
Goodwill   55.7    
Purchase price allocated to intangible assets   10.2    
Total revenues   11.4    
Net income   $ 1.6