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Revenue from Contracts with Customers - Disaggregation of Revenue by Product Type (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total Revenue $ 340,340 $ 308,616 $ 968,869 $ 828,461
Federated Funds        
Disaggregation of Revenue [Line Items]        
Total Revenue 280,970 248,428 793,496 691,641
Separate Accounts        
Disaggregation of Revenue [Line Items]        
Total Revenue 56,477 57,508 166,436 134,140
Other        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 2,893 $ 2,680 $ 8,937 $ 2,680