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Investments - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Investments—Affiliates and Other	$ 91,067	$ 87,805
Investments - consolidated investment companies	104,370	105,542
Debt Securities
Schedule of Investments [Line Items]
Investments - consolidated investment companies	56,900	65,200
Stocks of Large Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	36,100	28,500
Stocks of Small and Mid Sized Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	6,800	7,400
Federated Hermes Funds
Schedule of Investments [Line Items]
Investments—Affiliates and Other	80,900	77,600
Separate Accounts
Schedule of Investments [Line Items]
Investments—Affiliates and Other	10,200	10,200
Separate Accounts | Debt Securities
Schedule of Investments [Line Items]
Investments—Affiliates and Other	4,800	5,200
Separate Accounts | Stocks of Large Companies
Schedule of Investments [Line Items]
Investments—Affiliates and Other	$ 3,800	$ 3,400

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