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Revenue from Contracts with Customers - Disaggregation of Revenue by Product Type (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Total Revenue $ 363,918 $ 364,455 $ 360,712 $ 359,183 $ 358,025 $ 340,340 $ 321,479 $ 307,050 $ 1,448,268 $ 1,326,894 $ 1,135,677
Federated Hermes Funds                      
Disaggregation of Revenue [Line Items]                      
Total Revenue                 1,191,851 1,093,157 942,037
Separate Accounts                      
Disaggregation of Revenue [Line Items]                      
Total Revenue                 241,631 221,756 187,585
Other                      
Disaggregation of Revenue [Line Items]                      
Total Revenue                 $ 14,786 $ 11,981 $ 6,055