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Consolidation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Variable Interest Entities [Line Items]          
Fee waivers $ 118,200,000 $ 233,900,000 $ 444,700,000 $ 680,000,000  
Variable Interest Entity Not Primary Beneficiary          
Variable Interest Entities [Line Items]          
Assets under managed investments 6,900,000,000   6,900,000,000   $ 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 82,400,000   82,400,000   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   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 $ 89,100,000 $ 197,200,000 351,000,000 573,500,000  
Financial Support, Capital Contributions          
Variable Interest Entities [Line Items]          
Money market funds which meet the scope exception of the consolidation guidance     $ 0 $ 0