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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 1,916.6 | $ 3,978.7 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 15.4 | 21.6 |
Derivative Liability, Notional Amount | 2,975.6 | 920.2 |
Derivative Liability, Fair Value, Gross Liability | (27.6) | (7.0) |
Gain (loss) on derivatives, net | (82.5) | (8.2) | $ (23.5)
Forward Sales Of Reverse Loans |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 60.0 | 0.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.4 | 0.0 |
Derivative Liability, Notional Amount | 0.0 | 50.0 |
Derivative Liability, Fair Value, Gross Liability | 0.0 | (0.1) |
Gain (loss) on derivatives, net | $ 0.5 | (0.2) | (0.3)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on reverse loans held for investment and HMBS-related borrowings, net |  |
Forward loans IRLCs |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 0.0 | 592.5 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.0 | 5.1 |
Derivative Liability, Notional Amount | 1,311.6 | 0.0 |
Derivative Liability, Fair Value, Gross Liability | 0.7 | 0.0 |
Gain (loss) on derivatives, net | $ (5.8) | 6.4 | (17.4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on loans held for sale, net |  |
TBA Forward Pipelines Trades |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Gain (loss) on derivatives, net | $ 34.5 | 19.1 | 101.3
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on loans held for sale, net |  |
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 225.0 | 790.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 3.2 | 3.9 |
Derivative Liability, Notional Amount | 875.0 | 0.0 |
Derivative Liability, Fair Value, Gross Liability | 21.9 | 0.0 |
TBA/Forward Mortgage Backed Securities Trades Maturing January Through March 2022 And 2023 |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 1,391.1 | 1,818.6 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 10.0 | 10.1 |
TBA/Forward Mortgage Backed Securities Trades Maturing January Through March 2022 And January Through February 2023 |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Derivative Liability, Notional Amount | 789.0 | 854.9 |
Derivative Liability, Fair Value, Gross Liability | 5.0 | 6.8 |
Interest Rate Swap Futures And TBA Forward MBS Trades |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Gain (loss) on derivatives, net | $ (112.9) | (33.1) | (106.9)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs |  |
Others |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Derivative Liability, Notional Amount | $ 0.0 | 15.3 |
Derivative Liability, Fair Value, Gross Liability | 0.0 | (0.1) |
Other |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Gain (loss) on derivatives, net | $ 0.0 | 0.2 | 1.0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other revenue, net |  |
TBA Reverse Loan Trades |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Gain (loss) on derivatives, net | $ 0.0 | 0.0 | (0.3)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on reverse loans held for investment and HMBS-related borrowings, net |  |
Forward Trades |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 215.0 | 5.5 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 1.5 | 0.0 |
Gain (loss) on derivatives, net | $ 1.5 | (0.4) | 0.4
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on loans held for sale, net |  |
Option Contracts |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 0.0 | 750.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.0 | 1.9 |
Reverse Loans IRLCs |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 25.6 | 22.1 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.2 | 0.6 |
Gain (loss) on derivatives, net | $ (0.3) | $ (0.1) | $ (1.4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on reverse loans held for investment and HMBS-related borrowings, net |  |

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