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Securitizations and Variable Interest Entities - Schedule Of Securitization Reverse Mortgage Loans Buyouts And Financing Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net $ 152.1 $ 154.8  
Debt service accounts 37.2   $ 21.5
Mortgage loan financing facilities, net ($315.7 and $143.4 related to VIEs) 1,108.9 710.6  
Liabilities 12,658.0 12,111.9  
Other restricted cash 28.9   $ 17.8
Total Assets 13,090.1 12,513.7  
Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net 44.6 19.9  
Mortgage loan financing facilities, net ($315.7 and $143.4 related to VIEs) 315.7 143.4  
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 241.5 119.5  
Receivables, net 44.6 19.9  
Real estate owned 19.2 12.5  
Mortgage loan financing facilities, net ($315.7 and $143.4 related to VIEs) 356.0 164.4  
Unamortized discount and debt issuance costs (40.2) (21.0)  
Accrued expenses (Other liabilities) 1.2 0.5  
Liabilities 317.0 143.8  
Other restricted cash 20.6 6.8  
Total Assets 325.8 158.6  
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 $ 150.1 $ 150.1