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Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Total Revenue $ 366,008 $ 311,040 $ 690,772 $ 652,213
Equity        
Disaggregation of Revenue [Line Items]        
Total Revenue 132,602 171,595 279,459 337,953
Money market        
Disaggregation of Revenue [Line Items]        
Total Revenue 145,807 49,286 232,097 129,978
Fixed-income        
Disaggregation of Revenue [Line Items]        
Total Revenue 51,954 57,716 109,828 114,493
Other        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 35,645 $ 32,443 $ 69,388 $ 69,789