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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, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |  |
Servicing Asset | $ 2,547.4 | $ 2,466.3 |
Debt service account (Restricted cash) | 24.8 |  | $ 37.2
Unamortized debt issuance costs | (29.9) | (35.4) |
Secured Debt |  |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |  |
Unamortized debt issuance costs | 0.0 | (0.1) |
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 | 821.1 | 814.9 |
Debt service account (Restricted cash) | 0.1 | 1.8 |
Short-Term Debt | 554.8 | 440.7 |
Unamortized debt issuance costs | $ 0.0 | $ (0.1) |

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