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Fair Value Measurements - Schedule of Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other investment assets measured at fair value $ 213,042 $ 288,955    
Total Level 3 securities 566,725 551,689    
Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 securities 249,539 297,332 $ 260,479 $ 187,980
CLO and other ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Level 3 securities 308,218 245,313 $ 210,407 $ 153,342
Valuation Technique, Discounted Cash Flow        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value 353,683 262,734    
Valuation Technique, Discounted Cash Flow | Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value 154,935 135,524    
Valuation Technique, Discounted Cash Flow | CLO and other ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value $ 198,748 $ 127,210    
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Minimum | Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input (0.044) (0.044)    
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Minimum | CLO and other ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input (0.0097) 0.0001    
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Maximum | Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.053 0.053    
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Maximum | CLO and other ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.196 0.196    
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Weighted Average | Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.017 0.019    
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Weighted Average | CLO and other ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities, available-for-sale, measurement input 0.023 0.024