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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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