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Securitizations and Variable Interest Entities - Schedule Of Securitization Reverse Mortgage Loans Buyouts And Financing Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure $ 1,352.9   $ 683.1
Receivables, net 188.6 $ 180.8  
Debt service accounts 71.2   $ 13.6
Mortgage loan financing facilities, net ($238.3 and $— related to VIEs) 1,515.0 702.7  
Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Receivables, net 44.2 0.0  
Mortgage loan financing facilities, net ($238.3 and $— related to VIEs) 238.3 $ 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 141.1    
Receivables, net 44.2    
Real estate owned 12.5    
Debt service accounts 50.8    
Mortgage loan financing facilities, net ($238.3 and $— related to VIEs) 264.9    
Unamortized discount and debt issuance costs 26.6    
Prepaid interest (Other assets) 0.7    
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 $ 100.3