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Securitizations and Variable Interest Entities - Carrying Value and Classification of Assets And Liabilities of PLS Notes Facility (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Servicing Asset $ 2,859.8 $ 2,665.2  
Debt service account (Restricted cash) 29.7   $ 16.1
Debt Issuance Costs, Net 11.8 7.7  
Secured Debt      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Unamortized debt issuance costs 0.5 0.8  
Variable Interest Entity, Primary Beneficiary | Secured Debt | Agency and PLS Mortgage Servicing Rights Financing Facility      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Servicing Asset 501.9 696.9  
Debt service account (Restricted cash) 1.7 1.8  
Short-Term Debt $ 283.8 $ 366.5