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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
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights (MSRs), at fair value $ 2,466.3 $ 2,272.2  
Debt service accounts 33.6 32.3 $ 22.3
Secured Debt      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Unamortized debt issuance costs (0.1) (0.4)  
Variable Interest Entity, Primary Beneficiary | Agency and PLS Mortgage Servicing Rights Financing Facility | Secured Debt      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights (MSRs), at fair value 814.9 449.6  
Debt service accounts 1.8 1.7  
Short-term debt 440.7 282.1  
Unamortized debt issuance costs $ (0.1) $ (0.4)