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Consolidation - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
vIE
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
vIE
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Variable Interest Entities [Line Items]          
Fee waivers $ 105,700,000 $ 103,100,000 $ 211,200,000 $ 211,300,000  
Other current assets 15,927,000   15,927,000   $ 4,796,000
Variable Interest Entity Not Primary Beneficiary          
Variable Interest Entities [Line Items]          
AUM for non-consolidated Federated Hermes Funds $ 10,600,000,000   $ 10,600,000,000   10,000,000,000.0
Variable Interest Entity, Primary Beneficiary          
Variable Interest Entities [Line Items]          
Number of VIEs consolidated | vIE 2        
Number of VIEs deconsolidated | vIE     0    
Other current assets $ 4,400,000   $ 4,400,000   1,200,000
Variable Interest Entity, Primary Beneficiary | Foreign Currency Forward          
Variable Interest Entities [Line Items]          
Derivative asset 140,300,000   140,300,000   35,700,000
Derivative liability 138,800,000   138,800,000   35,600,000
Other current assets 1,500,000   1,500,000   100,000
Cash and Cash Equivalents | Variable Interest Entity Not Primary Beneficiary | Affiliates          
Variable Interest Entities [Line Items]          
Federated Hermes' maximum risk of loss 129,300,000   129,300,000   161,100,000
Accounts Receivable | Variable Interest Entity Not Primary Beneficiary          
Variable Interest Entities [Line Items]          
Federated Hermes' maximum risk of loss 1,200,000   1,200,000   $ 1,700,000
Financial Support, Fee Waivers          
Variable Interest Entities [Line Items]          
Money market funds which meet the scope exception of the consolidation guidance $ 78,200,000 $ 77,400,000 157,400,000 158,500,000  
Financial Support, Capital Contributions          
Variable Interest Entities [Line Items]          
Money market funds which meet the scope exception of the consolidation guidance     $ 0 $ 0