Consolidation - Narrative (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2024 USD ($) vIE	Mar. 31, 2024 vIE	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Variable Interest Entities [Line Items]
Fee waivers	$ 110,300,000		$ 142,400,000	$ 321,600,000	$ 398,800,000
Number of VIEs consolidated | vIE	1	1
Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Assets under managed investments	$ 10,600,000,000			10,600,000,000		$ 9,300,000,000
Cash and Cash Equivalents | Variable Interest Entity Not Primary Beneficiary | Affiliates
Variable Interest Entities [Line Items]
Federated Hermes' maximum risk of loss	165,100,000			165,100,000		133,900,000
Accounts Receivable | Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Federated Hermes' maximum risk of loss	1,200,000			1,200,000		$ 1,100,000
Financial Support, Fee Waivers
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	$ 83,300,000		$ 114,000,000.0	241,800,000	313,500,000
Financial Support, Capital Contributions
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance				$ 0	$ 0