Consolidation - Consolidated Federated Fund VIEs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Consolidated VIE assets	$ 1,925,909	$ 1,880,131
Less: Liabilities	683,715	626,765
Less: Redeemable Noncontrolling Interest in Subsidiaries	3,000	9,300
Variable Interest Entity, Primary Beneficiary
Variable Interest Entities [Line Items]
Less: Liabilities	100	100
Federated Hermes' Net Interest in Federated Hermes Fund VIEs	3,600	4,200
Variable Interest Entity, Primary Beneficiary | Investments—Consolidated Investment Companies
Variable Interest Entities [Line Items]
Consolidated VIE assets	6,100	13,300
Variable Interest Entity, Primary Beneficiary | Other Assets
Variable Interest Entities [Line Items]
Consolidated VIE assets	$ 600	$ 300