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Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Total Revenue $ 326,589 $ 364,455 $ 978,802 $ 1,084,350
Equity        
Disaggregation of Revenue [Line Items]        
Total Revenue 172,349 138,590 510,302 399,208
Fixed-income        
Disaggregation of Revenue [Line Items]        
Total Revenue 60,622 49,407 175,115 139,705
Money market        
Disaggregation of Revenue [Line Items]        
Total Revenue 55,726 143,391 185,704 452,240
Other        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 37,892 $ 33,067 $ 107,681 $ 93,197