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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
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Servicing Asset $ 2,374.7 $ 2,272.2  
Debt service account (Restricted cash) 37.2   $ 21.5
Unamortized debt issuance costs (40.2) (21.0)  
Secured Debt      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Unamortized debt issuance costs (0.6) (0.4)  
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 494.9 449.6  
Debt service account (Restricted cash) 1.6 1.7  
Short-Term Debt 327.9 282.1  
Unamortized debt issuance costs $ (0.6) $ (0.4)