Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Apr. 01, 2023	Jan. 01, 2022	Sep. 30, 2023	Dec. 31, 2022
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