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Consolidation - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Variable Interest Entities [Line Items]
Fee waivers	$ 233,900,000	$ 174,600,000	$ 680,000,000	$ 490,000,000
Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Assets under managed investments	9,300,000,000		9,300,000,000		$ 9,100,000,000
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	150,700,000		150,700,000		106,000,000
Receivables - Affiliates | Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Federated Hermes' maximum risk of loss in non-consolidated investment companies	600,000		600,000		$ 400,000
Financial Support, Fee Waivers
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	197,200,000	145,100,000	573,500,000	386,800,000
Financial Support, Capital Contributions
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	$ 0	$ 0	$ 0	$ 0

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