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Securitizations and Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities of Loans Held for Sale Financing Facility (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]        
Loans held for sale, at fair value $ 674.2 $ 617.8 $ 917.5 $ 366.4
Mortgages Held-for-sale, Fair Value Disclosure 674.2 617.8    
Receivables, net ($19.9 and $0.0 related to VIEs) 154.8 180.8    
Debt service accounts 32.3 22.3 10.0  
Mortgage loan financing facilities ($143.4 and $0.0 related to VIEs) 710.6 702.7    
Restricted cash 21.2 43.9 $ 60.7  
Variable Interest Entity, Primary Beneficiary        
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]        
Receivables, net ($19.9 and $0.0 related to VIEs) 19.9 0.0    
Mortgage loan financing facilities ($143.4 and $0.0 related to VIEs) 143.4 $ 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 119.5      
Receivables, net ($19.9 and $0.0 related to VIEs) 19.9      
Real Estate Owned 12.5      
Debt service accounts 6.3      
Mortgage loan financing facilities ($143.4 and $0.0 related to VIEs) 164.4      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 21.0      
Restricted cash $ 0.4