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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Derivative [Line Items] |  |  |  |  |
Notional balance | $ 1,803.2 |  | $ 1,803.2 |  | $ 937.8
Derivatives, at fair value | 13.6 |  | 13.6 |  | 7.7
Derivative liability, notional amount | 3,663.7 |  | 3,663.7 |  | 1,371.4
Derivative liability, fair value | (24.3) |  | (24.3) |  | (15.7)
Gains (losses) on derivatives | (37.3) | $ 6.0 | (81.3) | $ (12.7) |
Forward Sales Of Reverse Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 15.0 |  | 15.0 |  | 20.0
Derivatives, at fair value | 0.0 |  | 0.0 |  | 0.1
Derivative liability, notional amount | 31.6 |  | 31.6 |  | 20.0
Derivative liability, fair value | (0.1) |  | (0.1) |  | (0.1)
Gains (losses) on derivatives | (0.2) | (0.5) | (0.2) | (0.3) |
Forward loans IRLCs |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability, notional amount | 916.9 |  | 916.9 |  | 540.1
Derivative liability, fair value | 1.6 |  | 1.6 |  | 1.3
Gains (losses) on derivatives | (2.7) | (18.0) | (0.2) | (28.8) |
Reverse loans IRLCs |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 20.2 |  | 20.2 |  | 13.8
Derivatives, at fair value | 0.4 |  | 0.4 |  | 0.6
Gains (losses) on derivatives | 0.1 | (0.3) | (0.2) | (1.4) |
Reverse loan IRLCs - EquityIQ loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | 0.0 | 0.3 | 0.0 | 0.0 |
TBA forward MBS trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 1,244.0 |  | 1,244.0 |  | 804.0
Derivatives, at fair value | 11.0 |  | 11.0 |  | 6.6
Derivative liability, notional amount | 863.0 |  | 863.0 |  | 85.0
Derivative liability, fair value | (10.0) |  | (10.0) |  | (0.7)
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 335.0 |  | 335.0 |  | 0.0
Derivatives, at fair value | 0.8 |  | 0.8 |  | 0.0
Derivative liability, notional amount | 915.0 |  | 915.0 |  | 670.0
Derivative liability, fair value | (11.0) |  | (11.0) |  | (13.6)
Interest rate option contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability, notional amount | 900.0 |  | 900.0 |  | 0.0
Derivative liability, fair value | (1.4) |  | (1.4) |  | 0.0
TBA Forward Pipelines Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | 33.1 | 48.4 | 37.9 | 124.6 |
TBA Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | 0.0 | (0.1) | 0.0 | (0.2) |
Interest Rate Swap Futures And TBA Forward MBS Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | (68.6) | (23.8) | (119.7) | (107.5) |
Other |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability, notional amount | 27.2 |  | 27.2 |  | 56.4
Derivative liability, fair value | (0.2) |  | (0.2) |  | (0.1)
Other Derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | (0.1) | 0.0 | 0.2 | 0.9 |
Forward Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 189.0 |  | 189.0 |  | 100.0
Derivatives, at fair value | 1.4 |  | 1.4 |  | 0.4
Derivative liability, notional amount | 10.0 |  | 10.0 |  | 0.0
Derivative liability, fair value | 0.0 |  | 0.0 |  | $ 0.0
Forward LHFS Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | $ 1.0 | $ 0.0 | $ 1.0 | $ 0.0 |

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