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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Derivative [Line Items] |  |  |  |  |
Notional balance | $ 4,419.2 |  | $ 4,419.2 |  | $ 3,978.7
Derivatives, at fair value | 12.6 |  | 12.6 |  | 21.6
Derivative liability, notional amount | 2,730.5 |  | 2,730.5 |  | 920.2
Derivative liability, fair value | (9.9) |  | (9.9) |  | (7.0)
Gains (losses) on derivatives | (46.7) | $ (47.4) | (96.0) | $ (44.0) |
Forward Sales Of Reverse Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 20.0 |  | 20.0 |  | 0.0
Derivatives, at fair value | 0.0 |  | 0.0 |  | 0.0
Derivative liability, notional amount | 20.0 |  | 20.0 |  | 50.0
Derivative liability, fair value | 0.0 |  | 0.0 |  | (0.1)
Gains (losses) on derivatives | (0.2) | 0.0 | 0.1 | 0.0 |
Forward loans IRLCs |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 1,532.4 |  | 1,532.4 |  | 592.5
Derivatives, at fair value | 3.5 |  | 3.5 |  | 5.1
Gains (losses) on derivatives | (1.0) | (3.2) | (1.6) | 2.4 |
Reverse loans IRLCs |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 22.2 |  | 22.2 |  | 22.1
Derivatives, at fair value | 0.6 |  | 0.6 |  | 0.6
Gains (losses) on derivatives | 0.1 | (0.2) | 0.1 | (0.3) |
TBA forward MBS trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 2,269.7 |  | 2,269.7 |  | 1,818.6
Derivatives, at fair value | 7.5 |  | 7.5 |  | 10.1
Derivative liability, notional amount | 2,110.5 |  | 2,110.5 |  | 854.9
Derivative liability, fair value | (8.2) |  | (8.2) |  | (6.8)
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 250.0 |  | 250.0 |  | 790.0
Derivatives, at fair value | 0.5 |  | 0.5 |  | 3.9
Derivative liability, notional amount | 350.0 |  | 350.0 |  | 0.0
Derivative liability, fair value | (1.5) |  | (1.5) |  | 0.0
Interest rate option contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 250.0 |  | 250.0 |  | 750.0
Derivatives, at fair value | 0.2 |  | 0.2 |  | 1.9
Derivative liability, notional amount | 250.0 |  | 250.0 |  | 0.0
Derivative liability, fair value | (0.2) |  | (0.2) |  | 0.0
TBA Forward Pipelines Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | 4.8 | 21.2 | 9.7 | 4.8 |
Interest Rate Swap Futures And TBA Forward MBS Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | (50.6) | (65.2) | (104.3) | (51.1) |
Other |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability, notional amount | 0.0 |  | 0.0 |  | 15.3
Derivative liability, fair value | 0.0 |  | 0.0 |  | (0.1)
Other Derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | 0.0 | 0.0 | 0.0 | 0.3 |
Forward Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 0.0 |  | 0.0 |  | 5.5
Derivatives, at fair value | 0.0 |  | 0.0 |  | 0.0
Forward LHFS Trades |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivatives | 0.3 | $ 0.0 | 0.0 | $ 0.0 |
Treasury Futures Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional balance | 75.0 |  | 75.0 |  | 0.0
Derivatives, at fair value | $ 0.1 |  | $ 0.1 |  | $ 0.0

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