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Investments - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Investments in affiliates and other	$ 71,544	$ 45,593
Investments - consolidated investment companies	98,925	91,359
Debt Securities
Schedule of Investments [Line Items]
Investments - consolidated investment companies	74,300	48,600
Stocks of Large Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	10,700	35,200
Stocks of Small and Mid Sized Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	7,200	6,400
Investment Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	6,700	1,200
Federated Hermes Funds
Schedule of Investments [Line Items]
Investments in affiliates and other	61,000	36,000
Separate Accounts
Schedule of Investments [Line Items]
Investments in affiliates and other	10,500	9,600
Separate Accounts | Debt Securities
Schedule of Investments [Line Items]
Investments in affiliates and other	5,400	5,200
Separate Accounts | Stocks of Large Companies
Schedule of Investments [Line Items]
Investments in affiliates and other	$ 3,600	$ 3,100

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