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Investments - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | $ 45,593 | $ 26,935
Investments - consolidated investment companies | 91,359 | 64,526
Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 48,600 | 38,900
Stocks of large US and international companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 35,200 | 22,600
Stocks of small and mid-sized US and international companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 6,400 | 2,800
Federated Hermes Funds |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 36,000 | 20,100
Separate Accounts |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 9,600 | 6,800
Separate Accounts | Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 5,200 | 2,600
Separate Accounts | Stocks of large US and international companies |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | $ 3,100 | $ 3,000

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