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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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