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Leases - Narrative (Details)
$ in Millions
12 Months Ended
Sep. 30, 2023
USD ($)
option
Sep. 30, 2022
USD ($)
Lessee, Lease, Description [Line Items]    
Number of options to renew (or more) | option 1  
Termination period 2 years  
Operating right of use assets $ 122.1 $ 121.8
Operating lease liabilities $ 149.3 $ 143.0
Building | Minimum    
Lessee, Lease, Description [Line Items]    
Renewal term 3 years  
Building | Maximum    
Lessee, Lease, Description [Line Items]    
Renewal term 10 years