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Nonconsolidated Variable Interest Entities (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Variable Interest Entity [Line Items]    
Maximum exposure to loss $ 1,499.6 $ 1,300.4
Investments [Member]    
Variable Interest Entity [Line Items]    
Maximum exposure to loss 1,274.5 1,074.4
Receivables [Member]    
Variable Interest Entity [Line Items]    
Maximum exposure to loss $ 225.1 $ 226.0