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Consolidation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Accounts receivable from Federated Hermes Funds	$ 41,100,000	$ 37,600,000
Fee waivers	675,300,000	427,300,000	$ 358,200,000
Investments, deconsolidation	6,000,000.0
Non-Consolidated Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
AUM for nonconsolidated Federated Hermes Funds	9,100,000,000	9,600,000,000
Cash and Cash Equivalents | Non-Consolidated Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Federated's maximum risk of loss in non-consolidated investment companies	106,000,000.0	111,900,000
Accounts Receivable | Non-Consolidated Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Federated's maximum risk of loss in non-consolidated investment companies	400,000	1,100,000
Financial Support, Fee Waivers
Variable Interest Entity [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	537,800,000	311,600,000	242,900,000
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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