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Business Segment and Geographic Information - Schedule of Information Regarding Revenue by Client Sector (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Business Segment and Geographic Information
Total revenue	$ 404,951	$ 310,613	$ 813,690	$ 639,862
Operating expenses	242,457	194,278	483,518	400,961
Operating income	162,494	116,335	330,172	238,901
Institutional
Business Segment and Geographic Information
Total revenue	245,581	183,828	492,918	382,680
Wholesale
Business Segment and Geographic Information
Total revenue	94,272	73,329	191,483	149,429
Retail
Business Segment and Geographic Information
Total revenue	35,871	30,680	71,040	62,543
Market Data
Business Segment and Geographic Information
Total revenue	$ 29,227	$ 22,776	$ 58,249	$ 45,210

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