Revenue from Contracts with Customers - Disaggregation of Revenue by Product Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total Revenue	$ 360,712	$ 321,479	$ 719,895	$ 628,529
Federated Hermes Funds
Disaggregation of Revenue [Line Items]
Total Revenue	299,125	264,174	596,009	512,527
Separate Accounts
Disaggregation of Revenue [Line Items]
Total Revenue	58,100	54,368	115,522	109,959
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,487	$ 2,937	$ 8,364	$ 6,043