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Investments - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Investments in affiliates and other	$ 67,292	$ 45,593
Investments - consolidated investment companies	92,798	91,359
Debt Securities
Schedule of Investments [Line Items]
Investments - consolidated investment companies	69,500	48,600
Stocks Of Large Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	8,500	35,200
Investment Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	8,000	1,200
Stocks Of Small And Mid Sized Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	6,900	6,400
Federated Hermes Funds
Schedule of Investments [Line Items]
Investments in affiliates and other	57,500	36,000
Separate Accounts
Schedule of Investments [Line Items]
Investments in affiliates and other	9,800	9,600
Separate Accounts | Debt Securities
Schedule of Investments [Line Items]
Investments in affiliates and other	5,200	5,200
Separate Accounts | Stocks Of Large Companies
Schedule of Investments [Line Items]
Investments in affiliates and other	$ 3,300	$ 3,100

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Investments - Affiliates And Other

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