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Consolidation - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Variable Interest Entities [Line Items]
Fee waivers	$ 198,500,000	$ 201,100,000
Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Assets under managed investments	6,000,000,000		$ 8,000,000,000
Cash and Cash Equivalents | Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Federated Hermes' maximum risk of loss in non-consolidated investment companies	94,100,000		170,600,000
Receivables - Affiliates | Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Federated Hermes' maximum risk of loss in non-consolidated investment companies	1,000,000		$ 700,000
Financial Support, Fee Waivers
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	164,800,000	168,000,000
Financial Support, Capital Contributions
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	$ 0	$ 0

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