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Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total Revenue $ 341,173 $ 359,183
Equity    
Disaggregation of Revenue [Line Items]    
Total Revenue 166,357 137,290
Money Market    
Disaggregation of Revenue [Line Items]    
Total Revenue 80,692 151,420
Fixed-Income    
Disaggregation of Revenue [Line Items]    
Total Revenue 56,777 46,607
Other    
Disaggregation of Revenue [Line Items]    
Total Revenue $ 37,347 $ 23,866