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Virtus Acquisition - Virtus Acquisition Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 02, 2020 | Jan. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition |  |  |  |  |
Purchase of noncontrolling interest |  |  | $ 173 | $ 0 | $ 0
Virtus Acquisition |  |  |  |  |
Business Acquisition |  |  |  |  |
Percentage of equity interests acquired | 70.00% |  |  |  |
Call option exercise period | 2 years |  |  |  |
Put option exercise period | 3 years |  |  |  |
Virtus Acquisition | Virtus Partners |  |  |  |  |
Business Acquisition |  |  |  |  |
Percentage of equity interests acquired |  | 100.00% |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 30.00% |  |  |  |
Purchase of noncontrolling interest |  | $ 173 |  |  |

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