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Consolidation - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Variable Interest Entities [Line Items]      
Fee waivers $ 105,600,000 $ 108,200,000  
Other current assets 2,170,000   $ 4,796,000
Variable Interest Entity Not Primary Beneficiary      
Variable Interest Entities [Line Items]      
AUM for non-consolidated Federated Hermes Funds 10,000,000,000.0   10,000,000,000.0
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entities [Line Items]      
Other current assets 1,200,000   1,200,000
Variable Interest Entity, Primary Beneficiary | Foreign Currency Forward      
Variable Interest Entities [Line Items]      
Derivative asset 35,300,000   35,700,000
Derivative liability 35,100,000   35,600,000
Other current assets 200,000   100,000
Cash and Cash Equivalents | Variable Interest Entity Not Primary Beneficiary | Affiliates      
Variable Interest Entities [Line Items]      
Federated Hermes' maximum risk of loss 127,300,000   161,100,000
Accounts Receivable | Variable Interest Entity Not Primary Beneficiary      
Variable Interest Entities [Line Items]      
Federated Hermes' maximum risk of loss 1,800,000   $ 1,700,000
Financial Support, Fee Waivers      
Variable Interest Entities [Line Items]      
Money market funds which meet the scope exception of the consolidation guidance 79,100,000 81,100,000  
Financial Support, Capital Contributions      
Variable Interest Entities [Line Items]      
Money market funds which meet the scope exception of the consolidation guidance $ 0 $ 0