Investments - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Affiliates
Schedule of Investments [Line Items]
Investments	$ 73,696	$ 106,952
Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	116,380	70,543
Stocks of Large Companies | Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	16,200	4,900
Debt Securities | Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	87,800	59,100
Stocks of Small and Mid Sized Companies | Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	8,100	4,200
Mutual Funds | Investments—Consolidated Investment Companies
Schedule of Investments [Line Items]
Investments	4,300	2,300
Federated Hermes Funds | Affiliates
Schedule of Investments [Line Items]
Investments	66,500	99,500
Separate Accounts | Affiliates
Schedule of Investments [Line Items]
Investments	7,200	7,500
Separate Accounts | Stocks of Large Companies | Affiliates
Schedule of Investments [Line Items]
Investments	3,100	3,400
Separate Accounts | Debt Securities | Affiliates
Schedule of Investments [Line Items]
Investments	$ 2,400	$ 2,400