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Securitizations and Variable Interest Entities - Schedule Of Securitization Reverse Mortgage Loans Buyouts And Financing Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net $ 167.4 $ 176.4  
Debt service accounts 35.1   $ 35.8
Mortgage loan financing facilities, net ($613.9 and $481.9 related to VIEs) 2,062.3 1,528.2  
Liabilities 15,556.1 15,942.5  
Other restricted cash 63.4   $ 42.7
Total Assets 16,107.4 16,435.4  
Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net 37.6 31.9  
Mortgage loan financing facilities, net ($613.9 and $481.9 related to VIEs) 613.9 481.9  
Variable Interest Entity, Primary Beneficiary | Warehouse Mortgage Loan Financing Facility      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure 478.6 375.4  
Receivables, net 37.6 31.9  
Real estate owned 58.3 39.4  
Mortgage loan financing facilities, net ($613.9 and $481.9 related to VIEs) 648.0 517.3  
Unamortized discount and debt issuance costs (34.1) (35.4)  
Accrued expenses (Other liabilities) 1.3 1.7  
Liabilities 615.2 483.6  
Other restricted cash 23.3 13.3  
Total Assets 597.7 460.0  
Variable Interest Entity, Primary Beneficiary | Mortgage Warehouse Agreement      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure $ 200.0 $ 200.0