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Consolidation - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Mar. 31, 2024
vIE
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Variable Interest Entities [Line Items]            
Fee waivers $ 103,100,000   $ 131,300,000 $ 211,300,000 $ 256,500,000  
Number of VIEs consolidated | vIE   1        
Variable Interest Entity Not Primary Beneficiary            
Variable Interest Entities [Line Items]            
Assets under managed investments 386,400,000     386,400,000   $ 9,300,000,000
Investments—Affiliates and Other | Variable Interest Entity Not Primary Beneficiary | Affiliates            
Variable Interest Entities [Line Items]            
Federated Hermes' maximum risk of loss 11,100,000     11,100,000    
Cash and Cash Equivalents | Variable Interest Entity Not Primary Beneficiary            
Variable Interest Entities [Line Items]            
Federated Hermes' maximum risk of loss           133,900,000
Accounts Receivable | Variable Interest Entity Not Primary Beneficiary            
Variable Interest Entities [Line Items]            
Federated Hermes' maximum risk of loss 300,000     300,000   $ 1,100,000
Financial Support, Fee Waivers            
Variable Interest Entities [Line Items]            
Money market funds which meet the scope exception of the consolidation guidance $ 77,400,000   $ 103,400,000 158,500,000 199,500,000  
Financial Support, Capital Contributions            
Variable Interest Entities [Line Items]            
Money market funds which meet the scope exception of the consolidation guidance       $ 0 $ 0