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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Total Revenue $ 326,589 $ 364,455 $ 978,802 $ 1,084,350
Federated Hermes Funds        
Disaggregation of Revenue [Line Items]        
Total Revenue 256,036 303,958 772,090 899,967
Separate Accounts        
Disaggregation of Revenue [Line Items]        
Total Revenue 66,404 57,111 195,441 172,633
Other        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 4,149 $ 3,386 $ 11,271 $ 11,750