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Investments - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments in affiliates and other | $ 67,292 | $ 45,593
Investments - consolidated investment companies | 92,798 | 91,359
Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 69,500 | 48,600
Stocks Of Large Companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 8,500 | 35,200
Investment Companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 8,000 | 1,200
Stocks Of Small And Mid Sized Companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 6,900 | 6,400
Federated Hermes Funds |  |
Schedule of Investments [Line Items] |  |
Investments in affiliates and other | 57,500 | 36,000
Separate Accounts |  |
Schedule of Investments [Line Items] |  |
Investments in affiliates and other | 9,800 | 9,600
Separate Accounts | Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments in affiliates and other | 5,200 | 5,200
Separate Accounts | Stocks Of Large Companies |  |
Schedule of Investments [Line Items] |  |
Investments in affiliates and other | $ 3,300 | $ 3,100

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