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Acquisitions - Narrative (Details) - USD ($) $ in Thousands | Apr. 01, 2023 | Jan. 01, 2022 | Sep. 30, 2023 | Dec. 31, 2022
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 397,098 | $ 348,836
AlphaSimplex Group, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price | $ 113,400 |  |  |
Goodwill | 48,262 |  |  |
Intangible assets | 55,400 |  |  |
Business acquisition, goodwill, expected tax deductible amount | $ 103,700 |  |  |
Business acquisition, goodwill, expected tax deductible period | 15 years |  |  |
Stone Harbor Investment Partners, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price |  | $ 30,100 |  |
Goodwill |  | 10,300 |  |
Intangible assets |  | $ 10,800 |  |

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