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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 937.8 | $ 2,764.8 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 7.7 | 21.7 |
Derivative Liability, Notional Amount | 1,371.4 | 1,645.0 |
Derivative Liability, Fair Value, Gross Liability | (15.7) | (3.1) |
Gain (loss) on derivatives, net | (23.5) | (13.3) | $ 35.3
Forward Sales Of Reverse Loans |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 20.0 | 175.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.1 | 0.4 |
Derivative Liability, Notional Amount | 20.0 | 0.0 |
Derivative Liability, Fair Value, Gross Liability | (0.1) | 0.0 |
Gain (loss) on derivatives, net | $ (0.3) | 0.4 | 0.0
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 | 1,022.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.0 | 16.1 |
Derivative Liability, Notional Amount | 540.1 | 0.0 |
Derivative Liability, Fair Value, Gross Liability | 1.3 | 0.0 |
Gain (loss) on derivatives, net | $ (17.4) | (6.2) | 17.5
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 | $ 101.3 | 1.5 | 0.0
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 | $ 0.0 | 792.5 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.0 | 1.7 |
Derivative Liability, Notional Amount | 670.0 | 0.0 |
Derivative Liability, Fair Value, Gross Liability | 13.6 | 0.0 |
Gain (loss) on derivatives, net | $ 0.0 | 0.0 | (10.1)
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 | 125.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.0 | 0.5 |
Derivative Liability, Notional Amount | 0.0 | 450.0 |
Derivative Liability, Fair Value, Gross Liability | 0.0 | 0.8 |
TBA/Forward Mortgage Backed Securities Trades Maturing January Through March 2022 And 2023 |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 804.0 | 587.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 6.6 | 0.9 |
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 | 85.0 | 1,195.0 |
Derivative Liability, Fair Value, Gross Liability | 0.7 | 1.2 |
Interest Rate Swap Futures And TBA Forward MBS Trades |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Gain (loss) on derivatives, net | $ (106.9) | (9.5) | 27.5
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | MSR valuation adjustments, net |  |
Others |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Derivative Liability, Notional Amount | $ 56.4 | 0.0 |
Derivative Liability, Fair Value, Gross Liability | (0.1) | (1.1) |
Gain (loss) on derivatives, net | $ 0.0 | 0.0 | 0.1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on loans held for sale, net |  |
Other |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Gain (loss) on derivatives, net | $ 1.0 | (1.1) | 0.0
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 | $ (0.3) | 0.0 | 0.0
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 | $ 100.0 | 0.0 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.4 | 0.0 |
Gain (loss) on derivatives, net | $ 0.4 | 0.0 | 0.0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on loans held for sale, net |  |
Reverse Loans IRLCs |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 13.8 | 63.3 |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0.6 | 2.0 |
Gain (loss) on derivatives, net | $ (1.4) | $ 1.5 | $ 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 |  |

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