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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Total Revenue $ 402,656 $ 381,143 $ 1,218,077 $ 1,071,915
Asset Management        
Disaggregation of Revenue [Line Items]        
Total Revenue 276,771 263,644 851,089 754,681
Administrative Services        
Disaggregation of Revenue [Line Items]        
Total Revenue 88,023 75,021 252,402 218,710
Distribution        
Disaggregation of Revenue [Line Items]        
Total Revenue 31,466 36,026 96,360 78,285
Other        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 6,396 $ 6,452 $ 18,226 $ 20,239