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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
MSRs, at fair value | $ 2,859.8 | $ 2,675.7 | $ 2,665.2 | $ 2,714.2 | $ 2,485.7 | $ 2,250.1
Assets serviced | 201,100.0 |  | 199,600.0 | 198,000.0 |  |
UPB of loans transferred | 45,093.6 |  | 37,571.1 |  |  |
Owned MSRs |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
MSRs, at fair value | 1,717.6 |  | 1,710.6 | 1,743.0 |  |
Assets serviced | 119,400.0 |  | 126,200.0 | 123,400.0 |  |
Rithm Transferred Mortgage Servicing Rights |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
MSRs, at fair value | 709.1 |  | 601.2 | 604.7 |  |
Assets serviced | 52,400.0 |  | 47,300.0 | 48,400.0 |  |
MAV Transferred MSRs |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
MSRs, at fair value | 433.1 |  | 353.4 | 366.6 |  |
Assets serviced | 29,200.0 |  | $ 26,100.0 | $ 26,200.0 |  |
Mortgage Servicing Rights Title Retained | Rithm Transferred Mortgage Servicing Rights |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
UPB of loans transferred | $ 10,100.0 |  |  |  |  |

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