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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | $ 2,665.2 | $ 2,250.1 |
Servicing assets at fair value, net additions recognized | $ (161.3) | $ 236.6 | $ 1,056.0
ServicingAssetAtFairValueOtherChangeInFairValueStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag | Realization of cash flows | Realization of cash flows | Realization of cash flows
Ending balance | $ 2,272.2 | $ 2,665.2 | $ 2,250.1
Servicing Asset at Fair Value, Period Increase (Decrease) | $ (231.7) | $ 178.5 | (100.7)
Financing Receivable, Percent Past Due | 7.50% | 11.10% |
Derivative, Gain (Loss) on Derivative, Net | $ 8.2 | $ 23.5 | 13.3
MSR valuation adjustments, net | $ (232.2) | $ (10.4) | (98.5)
Amount | 169,700.0 | 199,600.0 |
Total MSR Reserve Fair Value Gains (Losses) | $ 0.8 | $ (2.0) | 0.3
ESS Financing Liability |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Changes in fair value | 51.3 | 192.1 | 77.9
Runoff and Settlements | 64.2 | 104.1 | 89.4
Total Fair value changes in Servicing liability at fair value | $ 12.9 | $ (88.0) | $ 11.4
Financial Asset, 30 to 59 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 3.70% | 4.80% |
Financial Asset, 60 to 89 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 1.20% | 1.80% |
Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 2.60% | 4.50% |
Fair Value Non Agency Mortgage Servicing Rights |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 21.20% | 20.40% |
Amount | 23,800.0 | 62,000.0 |
Fair Value Non Agency Mortgage Servicing Rights | MAV Asset Vehicle LLC |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Servicing Asset At Fair Value, Amount, Derecognition | $ (421.7) |  |
Fair Value Non Agency Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 9.40% | 8.50% |
Fair Value Non Agency Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 3.60% | 3.30% |
Fair Value Non Agency Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 8.20% | 8.60% |
Fair Value GSE Mortgage Servicing Rights |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 1.90% | 1.60% |
Amount | 127,300.0 | 124,500.0 |
Fair Value GSE Mortgage Servicing Rights | MAV Asset Vehicle LLC |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Servicing transfers and adjustments |  | $ (39.0) |
Servicing Asset At Fair Value, Amount, Derecognition | $ (32.5) |  |
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 1.20% | 0.90% |
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 0.20% | 0.20% |
Fair Value GSE Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 0.50% | 0.50% |
Rithm and Other Transferred MSRs |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | $ 601.2 |  |
Ending balance | $ 244.8 | $ 601.2 |
Amount | 18,100.0 | 47,300.0 |
MAV Transferred Mortgage Servicing Rights |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | $ 353.4 |  |
Ending balance | $ 422.8 | $ 353.4 |
Amount | 28,800.0 | 26,100.0 |
Transferred MSR, Subject To Pledged Liability |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | $ 954.6 |  |
Ending balance | $ 667.6 | $ 954.6 |
Amount | 46,900.0 | 73,400.0 |
MSR |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | $ 2,665.2 |  |
Ending balance | $ 2,272.2 | $ 2,665.2 |
Amount | 169,700.0 | 199,600.0 |
Fair Value of GNMA Mortgage Servicing Rights |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 11.80% | 13.20% |
Amount | 18,600.0 | 13,100.0 |
Fair Value of GNMA Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 6.10% | 6.40% |
Fair Value of GNMA Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 2.00% | 2.20% |
Fair Value of GNMA Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Financing Receivable, Percent Past Due | 3.70% | 4.60% |

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