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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Total Revenue $ 381,143 $ 326,589 $ 1,071,915 $ 978,802
Asset Management        
Disaggregation of Revenue [Line Items]        
Total Revenue 263,644 230,210 754,681 692,188
Administrative Services        
Disaggregation of Revenue [Line Items]        
Total Revenue 75,021 76,853 218,710 228,904
Distribution        
Disaggregation of Revenue [Line Items]        
Total Revenue 36,026 12,460 78,285 37,679
Other        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 6,452 $ 7,066 $ 20,239 $ 20,031