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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance | $ 2,547.4 | $ 2,374.7 | $ 2,466.3 | $ 2,272.2 |
Sales | 0.1 |  | 0.3 |  |
Sales |  | (100.9) |  | (100.9) |
Recognized on the sale of residential mortgage loans | 82.4 | 67.7 | 142.9 | 102.4 |
Purchases of MSRs | 49.1 | 34.9 | 147.4 | 61.8 |
Servicing transfers and adjustments | (12.0) | (85.7) | (12.0) | (87.0) |
Changes in fair value recognized in earnings: |  |  |  |  |
Changes in valuation inputs or assumptions | 26.8 | 92.6 | 7.2 | 194.4 |
Realization of cash flows | (61.2) | (55.4) | (119.4) | (115.2) |
Ending balance | 2,632.6 |  | 2,632.6 |  |
Assets serviced | 181,500.0 |  | 181,500.0 |  | $ 170,300.0
Servicing Asset at Fair Value, Period Increase (Decrease) | (34.4) |  | (112.2) |  |
Servicing assets at fair value, net additions (sales) recognized | 119.7 |  | 278.6 |  |
Derivative, Gain (Loss) on Derivative, Net | 3.4 | 46.7 | (5.3) | 96.0 |
MSR valuation adjustments, net | 27.3 | 32.7 | 66.2 | 44.3 |
Total MSR Reserve Fair Value Gains (Losses) | (34.4) | 37.2 | (112.2) | 79.2 |
Financing Liability Mortgage Servicing Rights Pledged [Member] |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Sales | 7.5 | 5.8 | 14.2 | 12.7 |
Changes in fair value recognized in earnings: |  |  |  |  |
Realization of expected cash flows | 17.8 | 17.4 | 34.8 | 37.3 |
Derivative, Gain (Loss) on Derivative, Net | (5.5) | (50.6) | 15.3 | (104.3) |
Fair Value Agency Mortgage Servicing Rights |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Ending balance |  | 2,327.7 |  | 2,327.7 |
Servicing Asset at Fair Value, Period Increase (Decrease) |  | 37.2 |  | 79.2 |
Servicing assets at fair value, net additions (sales) recognized |  | (84.1) |  | $ (23.7) |
Fair Value Agency Mortgage Servicing Rights | MAV Asset Vehicle LLC |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
UPB of MSRs sold |  | $ 5,500.0 |  |  |
Rithm Capital Corp . and others |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 266.1 |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Ending balance | 259.0 |  | 259.0 |  |
Assets serviced | 18,300.0 |  | 18,300.0 |  | 19,000.0
Transferred MSR, Subject To Pledged Liability |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 596.7 |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Ending balance | 580.8 |  | 580.8 |  |
Assets serviced | 39,000.0 |  | 39,000.0 |  | 40,500.0
Fair Value GSE Mortgage Servicing Rights |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 1,902.5 |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Ending balance | 2,031.6 |  | 2,031.6 |  |
Assets serviced | 139,600.0 |  | 139,600.0 |  | 129,300.0
Fair Value GNMA Mortgage Servicing Rights |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 351.6 |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Ending balance | 397.7 |  | 397.7 |  |
Assets serviced | 21,400.0 |  | 21,400.0 |  | 19,400.0
Fair Value Non-Agency Mortgage Servicing Rights |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 212.2 |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Ending balance | 203.4 |  | 203.4 |  |
Assets serviced | $ 20,500.0 |  | $ 20,500.0 |  | $ 21,600.0

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