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Investments - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Investments—affiliates and other	$ 87,805	$ 45,593
Investments - consolidated investment companies	105,542	91,359
Debt Securities
Schedule of Investments [Line Items]
Investments - consolidated investment companies	65,200	48,600
Stocks of large companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	28,500	35,200
Stocks of small and mid sized companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	7,400	6,400
Separate Accounts
Schedule of Investments [Line Items]
Investments—affiliates and other	10,200	9,600
Separate Accounts | Debt Securities
Schedule of Investments [Line Items]
Investments—affiliates and other	5,200	5,200
Separate Accounts | Stocks of large companies
Schedule of Investments [Line Items]
Investments—affiliates and other	3,400	3,100
Federated Hermes Funds
Schedule of Investments [Line Items]
Investments—affiliates and other	$ 77,600	$ 36,000

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