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Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Total Revenue $ 324,764 $ 341,173
Equity    
Disaggregation of Revenue [Line Items]    
Total Revenue 146,856 166,357
Money market    
Disaggregation of Revenue [Line Items]    
Total Revenue 86,290 80,692
Fixed-income    
Disaggregation of Revenue [Line Items]    
Total Revenue 57,874 56,777
Other    
Disaggregation of Revenue [Line Items]    
Total Revenue $ 33,744 $ 37,347