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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Derivative [Line Items] |  |  |
Notional balance | $ 3,252.9 |  | $ 3,978.7
Derivatives, at fair value | 11.9 |  | 21.6
Derivative liability, notional amount | 2,782.7 |  | 920.2
Derivative liability, fair value | (7.1) |  | (7.0)
Gains (losses) on derivatives | (49.3) | $ 3.5 |
Forward Sales Of Reverse Loans |  |  |
Derivative [Line Items] |  |  |
Notional balance | 40.0 |  | 0.0
Derivatives, at fair value | 0.2 |  | 0.0
Derivative liability, notional amount | 0.0 |  | 50.0
Derivative liability, fair value | 0.0 |  | (0.1)
Gains (losses) on derivatives | 0.3 | 0.0 |
Forward loans IRLCs |  |  |
Derivative [Line Items] |  |  |
Notional balance | 1,176.6 |  | 592.5
Derivatives, at fair value | 4.5 |  | 5.1
Gains (losses) on derivatives | (0.6) | 5.7 |
Reverse loans IRLCs |  |  |
Derivative [Line Items] |  |  |
Notional balance | 25.5 |  | 22.1
Derivatives, at fair value | 0.6 |  | 0.6
Gains (losses) on derivatives | 0.0 | (0.1) |
TBA forward MBS trades |  |  |
Derivative [Line Items] |  |  |
Notional balance | 1,665.7 |  | 1,818.6
Derivatives, at fair value | 5.9 |  | 10.1
Derivative liability, notional amount | 2,097.7 |  | 854.9
Derivative liability, fair value | (5.3) |  | (6.8)
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Notional balance | 215.0 |  | 790.0
Derivatives, at fair value | 0.7 |  | 3.9
Derivative liability, notional amount | 635.0 |  | 0.0
Derivative liability, fair value | (1.4) |  | 0.0
Interest rate option contracts |  |  |
Derivative [Line Items] |  |  |
Notional balance | 0.0 |  | 750.0
Derivatives, at fair value | 0.0 |  | 1.9
TBA Forward Pipelines Trades |  |  |
Derivative [Line Items] |  |  |
Gains (losses) on derivatives | 4.9 | (16.4) |
Interest Rate Swap Futures And TBA Forward MBS Trades |  |  |
Derivative [Line Items] |  |  |
Gains (losses) on derivatives | (53.7) | 14.1 |
Other |  |  |
Derivative [Line Items] |  |  |
Derivative liability, notional amount | 0.0 |  | 15.3
Derivative liability, fair value | 0.0 |  | (0.1)
Other Derivatives |  |  |
Derivative [Line Items] |  |  |
Gains (losses) on derivatives | 0.0 | 0.3 |
Forward Trades |  |  |
Derivative [Line Items] |  |  |
Notional balance | 130.0 |  | 5.5
Derivatives, at fair value | 0.1 |  | 0.0
Derivative liability, notional amount | 50.0 |  | 0.0
Derivative liability, fair value | (0.3) |  | $ 0.0
Forward LHFS Trades |  |  |
Derivative [Line Items] |  |  |
Gains (losses) on derivatives | $ (0.3) | $ 0.0 |

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