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Investments - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Affiliates    
Schedule of Investments [Line Items]    
Investments $ 74,838 $ 106,952
Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 123,912 70,543
Stocks of Large Companies | Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 59,000 4,900
Debt Securities | Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 59,100 59,100
Stocks of Small and Mid Sized Companies | Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 4,600 4,200
Federated Hermes Funds | Affiliates    
Schedule of Investments [Line Items]    
Investments 67,300 99,500
Separate Accounts | Affiliates    
Schedule of Investments [Line Items]    
Investments 7,500 7,500
Separate Accounts | Stocks of Large Companies | Affiliates    
Schedule of Investments [Line Items]    
Investments 3,700 3,400
Separate Accounts | Debt Securities | Affiliates    
Schedule of Investments [Line Items]    
Investments $ 2,400 $ 2,400