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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | $ 2,250.1 | $ 1,294.8 | $ 1,486.4
Sales |  | (154.4) | 0.0 | (0.1)
Recognized on the sale of residential mortgage loans |  | 234.7 | 222.7 | 68.7
Purchase of MSRs | $ 575.3 | 181.6 | 844.1 | 285.1
Servicing transfers and adjustments |  | (25.3) | (10.8) | (265.8)
Servicing assets at fair value, net additions recognized |  | 236.6 | 1,056.0 | 87.9
Changes in valuation inputs or assumptions |  | $ 454.0 | $ 149.5 | $ (108.1)
ServicingAssetAtFairValueOtherChangeInFairValueStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag |  | Realization of cash flows | Realization of cash flows | Realization of cash flows
Realization of cash flows |  | $ (275.5) | $ (250.2) | $ (171.4)
Ending balance |  | 2,665.2 | 2,250.1 | 1,294.8
Servicing Asset at Fair Value, Period Increase (Decrease) |  | $ 178.5 | $ (100.7) | (279.5)
Financing Receivable, Percent Past Due |  | 11.10% | 10.50% |
Derivative, Gain (Loss) on Derivative, Net |  | $ 23.5 | $ 13.3 | (35.3)
MSR valuation adjustments, net |  | (10.4) | (98.5) | (135.2)
MSR realization of expected cash flows |  | 275.2 | 250.2 | 171.4
Total MSR fair value gains (losses) |  | (176.5) | 100.4 |
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions |  | (451.7) | (149.8) | 108.1
Financing Liability Excess Servicing Spread |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Changes in fair value |  | (1.4) | 0.0 | 0.0
Runoff and Settlements |  | 6.6 | 0.0 | 0.0
Total Fair value changes in Servicing liability at fair value |  | 8.0 | 0.0 | 0.0
ESS Financing Liability |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Changes in fair value |  | 192.1 | 77.9 | (3.8)
Runoff and Settlements |  | 104.1 | 89.4 | 113.0
Total Fair value changes in Servicing liability at fair value |  | (88.0) | 11.4 | 116.8
Derivative, Gain (Loss) on Derivative, Net |  | $ (106.9) | $ (9.5) | 27.5
Financial Asset, 30 to 59 Days Past Due |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Financing Receivable, Percent Past Due |  | 4.80% | 4.10% |
Financial Asset, 60 to 89 Days Past Due |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Financing Receivable, Percent Past Due |  | 1.80% | 1.60% |
Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Financing Receivable, Percent Past Due |  | 4.50% | 4.80% |
Fair Value Agency Mortgage Servicing Rights |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | $ 1,571.8 | $ 578.9 | 714.0
Sales |  | (154.4) | 0.0 | 0.0
Recognized on the sale of residential mortgage loans |  | 234.7 | 222.7 | 68.7
Purchase of MSRs |  | 181.6 | 844.1 | 285.1
Servicing transfers and adjustments |  | (24.3) | 0.1 | (266.2)
Servicing assets at fair value, net additions recognized |  | 237.6 | 1,067.0 | 87.6
Changes in valuation inputs or assumptions |  | 307.8 | 62.4 | (145.3)
Realization of cash flows |  | (185.4) | (136.5) | (77.4)
Ending balance |  | 1,931.8 | 1,571.8 | 578.9
Servicing Asset at Fair Value, Period Increase (Decrease) |  | $ 122.4 | $ (74.1) | (222.7)
Financing Receivable, Percent Past Due |  | 3.30% | 3.70% |
Fair Value 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 |  | 1.70% | 1.40% |
Fair Value 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 |  | 0.50% | 0.40% |
Fair Value 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 |  | 1.10% | 1.90% |
Fair Value Non-Agency Mortgage Servicing Rights |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | $ 678.3 | $ 715.9 | 772.4
Sales |  | 0.0 | 0.0 | (0.1)
Recognized on the sale of residential mortgage loans |  | 0.0 | 0.0 | 0.0
Purchase of MSRs |  | 0.0 | 0.0 | 0.0
Servicing transfers and adjustments |  | (0.9) | (10.9) | 0.4
Servicing assets at fair value, net additions recognized |  | (0.9) | (10.9) | 0.3
Changes in valuation inputs or assumptions |  | 146.2 | 87.1 | 37.3
Realization of cash flows |  | (90.1) | (113.7) | (94.0)
Ending balance |  | 733.5 | 678.3 | 715.9
Servicing Asset at Fair Value, Period Increase (Decrease) |  | $ 56.1 | $ (26.7) | $ (56.8)
Financing Receivable, Percent Past Due |  | 20.40% | 18.00% |
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 |  | 8.50% | 7.20% |
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 |  | 3.30% | 2.80% |
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 |  | 8.60% | 8.00% |

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