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Nonconsolidated Variable Interest Entities - Schedule of Maximum Exposure to Loss (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Variable Interest Entity [Line Items]    
Maximum exposure to loss $ 1,334.8 $ 1,300.4
Investments [Member]    
Variable Interest Entity [Line Items]    
Maximum exposure to loss 1,123.3 1,074.4
Receivables [Member]    
Variable Interest Entity [Line Items]    
Maximum exposure to loss $ 211.5 $ 226.0