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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Servicing Assets at Fair Value [Line Items] |  |  |  |
Servicing Asset at Fair Value, Amount | $ 2,466.3 | $ 2,272.2 | $ 2,665.2 | $ 2,250.1
UPB | 170,300.0 | 169,700.0 |  |
UPB of loans transferred | 49,641.2 | 46,810.1 |  |
Owned Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Servicing Asset at Fair Value, Amount | 1,869.6 | 1,604.6 |  |
MAV Transferred Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Servicing Asset at Fair Value, Amount | 330.6 | 422.8 |  |
Fair Value GSE Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Servicing Asset at Fair Value, Amount | 1,902.5 | 1,773.9 |  |
UPB | 129,300.0 | 127,300.0 |  |
Fair Value of GNMA Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Servicing Asset at Fair Value, Amount | 351.6 | 277.1 |  |
UPB | 19,400.0 | 18,600.0 |  |
Fair Value Non Agency Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Servicing Asset at Fair Value, Amount | 212.2 | 221.2 |  |
UPB | $ 21,600.0 | $ 23,800.0 |  |

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