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Related Party Transactions - Schedule of Affiliates were Included in the Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue:        
Total revenue $ 404,951 $ 310,613 $ 813,690 $ 639,862
Expenses        
Employee compensation and benefits 137,236 103,924 280,323 218,417
Technology and communications 24,230 18,701 45,540 36,268
Professional fees 13,324 10,666 25,124 21,842
Occupancy 4,976 4,028 9,649 8,151
Affiliated Entity        
Expenses        
Employee compensation and benefits 0 17 0 17
Technology and communications 1,556 1,487 3,128 2,651
General and administrative 2 (46) 5 0
Professional fees 39 0 65 1
Occupancy 26 20 39 20
Subscription fees        
Revenue:        
Total revenue 50,746 45,748 100,427 90,122
Subscription fees | Affiliated Entity        
Revenue:        
Total revenue 271 638 575 1,471
LSEG market data fees        
Revenue:        
Total revenue 20,581 15,461 41,081 31,055
LSEG market data fees | Affiliated Entity        
Revenue:        
Total revenue 20,581 15,461 41,081 31,055
Other fees        
Revenue:        
Total revenue 3,149 2,943 6,256 5,626
Other fees | Affiliated Entity        
Revenue:        
Total revenue $ 155 $ 136 $ 360 $ 250