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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | $ 2,272.2 | $ 2,665.2 | $ 2,665.2
Servicing Asset at Fair Value, Disposals | 0.0 | 0.0 |
Recognized on the sale of residential mortgage loans | 34.7 | 31.1 |
Purchases of MSRs | 27.0 | 25.0 |
Servicing transfers and adjustments | (1.3) | 0.0 |
Changes in fair value recognized in earnings: |  |  |
Changes in valuation inputs or assumptions | 101.8 | (83.6) |
Realization of cash flows | (59.8) | (57.1) |
Ending balance | 2,374.7 | 2,580.6 | 2,272.2
Assets serviced | 171,300.0 |  | 169,700.0
Servicing Asset at Fair Value, Period Increase (Decrease) | 42.0 | (140.7) |
Servicing assets at fair value, net additions (sales) recognized | 60.4 | 56.0 |
Derivative, Gain (Loss) on Derivative, Net | 49.3 | (3.5) |
MSR valuation adjustments, net | 11.6 | 69.0 |
Total MSR Reserve Fair Value Gains (Losses) | 42.0 | (140.5) |
ESS Financing Liability |  |  |
Changes in fair value recognized in earnings: |  |  |
Realization of expected cash flows | 12.5 | 14.5 |
Derivative, Gain (Loss) on Derivative, Net | (53.7) | 14.1 |
MSR Asset Vehicle LLC |  |  |
Changes in fair value recognized in earnings: |  |  |
UPB of MSRs sold | 18.0 | $ 8.0 |
Fair Value Non-Agency Mortgage Servicing Rights |  |  |
Changes in fair value recognized in earnings: |  |  |
Assets serviced | 23,000.0 |  | 23,800.0
Rithm Capital Corp . and others |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | 244.8 |  |
Changes in fair value recognized in earnings: |  |  |
Ending balance | 253.8 |  | 244.8
Assets serviced | 18,500.0 |  | 18,100.0
Transferred MSR, Subject To Pledged Liability |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | 667.6 |  |
Changes in fair value recognized in earnings: |  |  |
Ending balance | 667.4 |  | 667.6
Assets serviced | $ 46,800.0 |  | $ 46,900.0

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