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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total other investments at fair value $ 162,105 $ 0
Equity securities 11,191 $ 0
Investments in direct lending entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total other investments at fair value 49,978  
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, fair value 379,097  
Underwriting-related derivative liability 3,984  
Equity securities 11,191  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, fair value 138,919  
Underwriting-related derivative liability 3,984  
Equity securities 11,191  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Underwriting-related derivative liability $ 3,984  
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Net unrealized gains on fixed maturity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, valued by third party, percentage 100.00%