v3.26.1
Consolidation - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
variableInterestEntity
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Variable Interest Entities [Line Items]          
Fee waivers $ 110,200,000 $ 105,700,000 $ 220,300,000 $ 211,200,000  
Variable Interest Entity, Primary Beneficiary          
Variable Interest Entities [Line Items]          
Number of VIEs consolidated | variableInterestEntity     1    
Variable Interest Entity, Primary Beneficiary | Foreign Currency Forward          
Variable Interest Entities [Line Items]          
Derivative asset 9,500,000   $ 9,500,000   $ 11,900,000
Derivative liability 9,400,000   9,400,000   11,900,000
Variable Interest Entity Not Primary Beneficiary          
Variable Interest Entities [Line Items]          
AUM for non-consolidated Federated Hermes Funds 700,000,000   700,000,000   12,300,000,000
Balance Sheet Location [Axis]: us-gaap:AccountsReceivableNetCurrent | Variable Interest Entity Not Primary Beneficiary          
Variable Interest Entities [Line Items]          
Federated Hermes' maximum risk of loss 500,000   500,000   2,000,000.0
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Variable Interest Entity Not Primary Beneficiary | Affiliates          
Variable Interest Entities [Line Items]          
Federated Hermes' maximum risk of loss 15,400,000   15,400,000   $ 156,800,000
Financial Support, Fee Waivers          
Variable Interest Entities [Line Items]          
Money market funds which meet the scope exception of the consolidation guidance $ 82,100,000 $ 78,200,000 165,900,000 157,400,000  
Financial Support, Capital Contributions          
Variable Interest Entities [Line Items]          
Money market funds which meet the scope exception of the consolidation guidance     $ 0 $ 0