Investments - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Affiliates
Schedule of Investments [Line Items]
Investments	$ 106,952	$ 76,524
Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	70,543	108,448
Stocks of large companies | Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	4,900	45,300
Debt Securities | Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	59,100	57,800
Stocks of small and mid sized companies | Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	4,200	3,300
Federated Hermes Funds | Affiliates
Schedule of Investments [Line Items]
Investments	99,500	67,000
Separate Accounts | Affiliates
Schedule of Investments [Line Items]
Investments	7,500	9,500
Separate Accounts | Stocks of large companies | Affiliates
Schedule of Investments [Line Items]
Investments	3,400	3,400
Separate Accounts | Debt Securities | Affiliates
Schedule of Investments [Line Items]
Investments	$ 2,400	$ 4,600