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Mortgage Loans - Other Mortgage Loans and Real Estate Owned (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]    
Other mortgage loans and real estate owned, before loss reserves $ 15.7 $ 18.9
Financing Receivable, Allowance for Credit Loss $ 16.2 $ 12.3