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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Total Revenue $ 324,764 $ 341,173
Asset Management    
Disaggregation of Revenue [Line Items]    
Total Revenue 232,994 247,689
Administrative Services    
Disaggregation of Revenue [Line Items]    
Total Revenue 73,507 74,302
Distribution    
Disaggregation of Revenue [Line Items]    
Total Revenue 11,077 13,028
Other    
Disaggregation of Revenue [Line Items]    
Total Revenue $ 7,186 $ 6,154