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Consolidation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Fee waivers	$ 917,900,000	$ 675,300,000	$ 427,300,000
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Redeemable Noncontrolling Interest From Investments	5,000,000
AUM for nonconsolidated Federated Hermes Funds	8,000,000,000	9,100,000,000
Cash and Cash Equivalents | Non-Consolidated Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Federated Hermes' maximum risk of loss	170,600,000	106,000,000
Accounts Receivable | Non-Consolidated Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Federated Hermes' maximum risk of loss	700,000	400,000
Financial Support, Fee Waivers
Variable Interest Entity [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	775,600,000	537,800,000	311,600,000
Financial Support, Capital Contributions
Variable Interest Entity [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	$ 0	$ 0	$ 0

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