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Investments - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 89,318 | $ 45,593
Investments - consolidated investment companies | 54,075 | 91,359
Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 23,600 | 48,600
Stocks of Large Companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 22,800 | 35,200
Stocks of Small and Mid Sized Companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 7,100 | 6,400
Federated Hermes Funds |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 78,800 | 36,000
Separate Accounts |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 10,500 | 9,600
Separate Accounts | Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 5,300 | 5,200
Separate Accounts | Stocks of Large Companies |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 3,500 | $ 3,100

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