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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Total Revenue $ 311,040 $ 360,712 $ 652,213 $ 719,895
Asset Management        
Disaggregation of Revenue [Line Items]        
Total Revenue 214,289 245,126 461,978 485,787
Administrative Services        
Disaggregation of Revenue [Line Items]        
Total Revenue 77,750 83,733 152,051 155,932
Distribution        
Disaggregation of Revenue [Line Items]        
Total Revenue 12,191 25,579 25,219 64,513
Other        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 6,810 $ 6,274 $ 12,965 $ 13,663