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Property and Equipment, net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 365.4 $ 290.6
Less: accumulated depreciation and amortization (198.8) (147.5)
Property and equipment, net 166.6 143.1
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property and equipment 29.9 21.4
Software    
Property, Plant and Equipment [Line Items]    
Total property and equipment 45.3 41.5
Equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 67.3 57.9
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 68.6 56.7
Capitalized software development    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 154.3 $ 113.1