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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
--- | --- | --- | ---
Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 2,374.7 | $ 2,580.6 | $ 2,272.2 | $ 2,665.2
Servicing Asset at Fair Value, Disposals |  | (100.9) | 0.0 | (100.9) | 0.0
Recognized on the sale of residential mortgage loans |  | 67.7 | 31.5 | 102.4 | 62.6
Purchases of MSRs |  | 34.9 | 19.1 | 61.8 | 44.0
Servicing transfers and adjustments |  | (85.7) | (32.5) | (87.0) | (32.5)
Changes in fair value recognized in earnings: |  |  |  |  |
Changes in valuation inputs or assumptions |  | 92.6 | 136.8 | 194.4 | 53.2
Realization of cash flows |  | (55.4) | (59.7) | (115.2) | (116.8)
Ending balance | $ 2,272.2 | 2,327.7 |  | 2,327.7 |
Assets serviced | 169,700.0 | 162,900.0 |  | 162,900.0 |
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) |
Derivative, Gain (Loss) on Derivative, Net |  | 46.7 | 47.4 | 96.0 | 44.0
MSR valuation adjustments, net |  | 32.7 | 48.9 | 44.3 | 117.9
Total MSR Reserve Fair Value Gains (Losses) |  | 37.2 | 77.2 | 79.2 | (63.3)
ESS Financing Liability |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Realization of expected cash flows |  | 10.4 | 15.6 | 22.9 | 30.1
Derivative, Gain (Loss) on Derivative, Net |  | (50.6) | (65.2) | (104.3) | (51.1)
MSR Asset Vehicle LLC |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
UPB of MSRs sold |  |  |  | 30.1 | 17.9
Fair Value Agency Mortgage Servicing Rights |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Ending balance |  |  | 2,675.7 |  | 2,675.7
Servicing Asset at Fair Value, Period Increase (Decrease) |  |  | 77.1 |  | (63.6)
Servicing assets at fair value, net additions (sales) recognized |  |  | 18.1 |  | $ 74.1
Fair Value Agency Mortgage Servicing Rights | MAV Asset Vehicle LLC |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
UPB of MSRs sold |  | 5,500.0 | 2,300.0 |  |
Fair Value Non-Agency Mortgage Servicing Rights |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Assets serviced | 23,800.0 | 22,400.0 |  | 22,400.0 |
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 | 244.8 | 264.0 |  | 264.0 |
Assets serviced | 18,100.0 | 18,600.0 |  | 18,600.0 |
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 | 667.6 | 607.6 |  | 607.6 |
Assets serviced | 46,900.0 | 40,900.0 |  | 40,900.0 |
Fair Value GSE Mortgage Servicing Rights |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Assets serviced | $ 127,300.0 | 122,900.0 |  | $ 122,900.0 |
Fair Value GSE Mortgage Servicing Rights | MAV Asset Vehicle LLC |  |  |  |  |
Changes in fair value recognized in earnings: |  |  |  |  |
Servicing Asset At Fair Value, Amount Derecognized |  | $ 85.8 | $ 32.5 |  |

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