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Investments - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 43,209 | $ 26,935
Investments - consolidated investment companies | 71,103 | 64,526
Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 38,000 | 38,900
Stocks of large U.S. and international companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 26,800 | 22,600
Federated Hermes Funds |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 33,800 | 20,100
Separate Accounts |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 9,400 | 6,800
Separate Accounts | Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 5,500 | 2,600
Separate Accounts | Equity |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 3,000 | $ 3,000

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