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Investments - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Affiliates    
Schedule of Investments [Line Items]    
Investments $ 56,914 $ 54,160
Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 179,578 82,441
Stocks of Large Companies | Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 20,200 7,400
Debt Securities | Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 154,800 70,400
Stocks of Small and Mid Sized Companies | Investments—Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 4,600 4,700
Federated Hermes Funds | Affiliates    
Schedule of Investments [Line Items]    
Investments 50,300 48,000
Separate Accounts | Affiliates    
Schedule of Investments [Line Items]    
Investments 6,600 6,200
Separate Accounts | Stocks of Large Companies | Affiliates    
Schedule of Investments [Line Items]    
Investments 3,800 2,800
Separate Accounts | Debt Securities | Affiliates    
Schedule of Investments [Line Items]    
Investments $ 1,600 $ 1,800