Revenue from Contracts with Customers - Disaggregation of Revenue by Product Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total Revenue	$ 364,455	$ 340,340	$ 1,084,350	$ 968,869
Federated Hermes Funds
Disaggregation of Revenue [Line Items]
Total Revenue	303,958	280,970	899,967	793,496
Separate Accounts
Disaggregation of Revenue [Line Items]
Total Revenue	57,111	56,477	172,633	166,436
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,386	$ 2,893	$ 11,750	$ 8,937