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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, 2023
Dec. 31, 2022
Sep. 30, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure $ 944.7   $ 725.2
Receivables, net 164.7 $ 180.8  
Debt service accounts 29.7   16.1
Mortgage loan financing facilities, net ($166.4 and $0.0 related to VIEs) 1,034.7 702.7  
Other restricted cash 42.2   $ 29.2
Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net 29.4 0.0  
Mortgage loan financing facilities, net ($166.4 and $0.0 related to VIEs) 166.4 $ 0.0  
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 127.4    
Receivables, net 29.4    
Real estate owned 13.4    
Debt service accounts 8.4    
Mortgage loan financing facilities, net ($166.4 and $0.0 related to VIEs) 190.2    
Unamortized discount and debt issuance costs 23.9    
Other restricted cash 0.5    
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 $ 150.0