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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, 2024
Dec. 31, 2023
Sep. 30, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net $ 172.2 $ 154.8  
Debt service accounts 35.8   $ 29.7
Mortgage loan financing facilities, net ($518.7 and $143.4 related to VIEs) 1,355.9 710.6  
Liabilities 12,758.5 12,111.9  
Other restricted cash 42.7   $ 42.2
Total Assets 13,226.7 12,513.7  
Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net 46.6 19.9  
Mortgage loan financing facilities, net ($518.7 and $143.4 related to VIEs) 518.7 143.4  
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 395.2 119.5  
Receivables, net 46.6 19.9  
Real estate owned 40.5 12.5  
Mortgage loan financing facilities, net ($518.7 and $143.4 related to VIEs) 559.8 164.4  
Unamortized discount and debt issuance costs (41.1) (21.0)  
Accrued expenses (Other liabilities) 2.2 0.5  
Liabilities 520.9 143.8  
Other restricted cash 17.9 6.8  
Total Assets 500.1 158.6  
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 $ 150.1