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Consolidation - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Variable Interest Entities [Line Items] |  |  |  |  |
Fee waivers | $ 233,900,000 | $ 174,600,000 | $ 680,000,000 | $ 490,000,000 |
Variable Interest Entity Not Primary Beneficiary |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Assets under managed investments | 9,300,000,000 |  | 9,300,000,000 |  | $ 9,100,000,000
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 | 150,700,000 |  | 150,700,000 |  | 106,000,000
Receivables - Affiliates | Variable Interest Entity Not Primary Beneficiary |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Federated Hermes' maximum risk of loss in non-consolidated investment companies | 600,000 |  | 600,000 |  | $ 400,000
Financial Support, Fee Waivers |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Money market funds which meet the scope exception of the consolidation guidance | 197,200,000 | 145,100,000 | 573,500,000 | 386,800,000 |
Financial Support, Capital Contributions |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Money market funds which meet the scope exception of the consolidation guidance | $ 0 | $ 0 | $ 0 | $ 0 |

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