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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, 2023
Dec. 31, 2022
Mar. 31, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Servicing Asset $ 2,580.6 $ 2,665.2  
Debt service account (Restricted cash) 21.5   $ 13.1
Debt Issuance Costs, Net 5.7 7.7  
Secured Debt      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Unamortized debt issuance costs 0.6 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 599.8 696.9  
Debt service account (Restricted cash) 1.9 1.8  
Debt Issuance Costs, Net 0.6 1.1  
Short-Term Debt 342.3 366.5  
Unamortized debt issuance costs $ 0.6 $ 0.8