Consolidation - Consolidated Federated Fund VIEs (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Consolidated VIE assets	$ 1,933,895	$ 1,880,131
Less: Liabilities	$ 642,556	626,765
Variable Interest Entity, Primary Beneficiary
Variable Interest Entities [Line Items]
Less: Liabilities		100
Less: Redeemable Noncontrolling Interest in Subsidiaries		9,300
Federated Hermes' Net Interest in Federated Hermes Fund VIEs		4,200
Variable Interest Entity, Primary Beneficiary | Investments—Consolidated Investment Companies
Variable Interest Entities [Line Items]
Consolidated VIE assets		13,300
Variable Interest Entity, Primary Beneficiary | Other Assets
Variable Interest Entities [Line Items]
Consolidated VIE assets		$ 300