v3.24.1.u1
Nonconsolidated Variable Interest Entities - Schedule of Maximum Exposure to Loss (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Variable Interest Entity [Line Items]    
Maximum exposure to loss $ 1,248.6 $ 1,132.0
Investments [Member]    
Variable Interest Entity [Line Items]    
Maximum exposure to loss 1,030.7 925.9
Receivables [Member]    
Variable Interest Entity [Line Items]    
Maximum exposure to loss $ 217.9 $ 206.1