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Consolidation - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Variable Interest Entities [Line Items]
Fee waivers	$ 245,000,000.0	$ 184,900,000	$ 446,100,000	$ 315,400,000
Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
AUM for nonconsolidated Federated Hermes Funds	7,500,000,000		7,500,000,000		$ 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	128,600,000		128,600,000		106,000,000.0
Receivables - Affiliates | Variable Interest Entity Not Primary Beneficiary
Variable Interest Entities [Line Items]
Federated Hermes' maximum risk of loss in non-consolidated investment companies	500,000		500,000		$ 400,000
Financial Support, Fee Waivers
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	208,200,000	141,600,000	376,300,000	241,700,000
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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