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Fair Value Measurement - Ranges of Significant Unobservable Inputs to Value Level 3 Assets (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 349,200 $ 281,533
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 179,001 192,891
Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 214,667 236,718
Debt | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 137,055 159,954
Debt | Level 3 | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 97,988 117,413
Debt | Level 3 | Recent Transaction    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1]   35,710
Debt | Level 3 | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 38,099 $ 6,831
Debt | Level 3 | Broker Quotes    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] $ 968  
Debt | Level 3 | Minimum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0825 0.0937
Debt | Level 3 | Minimum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0015 0.003
Debt | Level 3 | Minimum | Broker Quotes    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) 0.93  
Debt | Level 3 | Maximum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.3165 0.2248
Debt | Level 3 | Maximum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.06 0.08
Debt | Level 3 | Maximum | Broker Quotes    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) 0.985  
Debt | Level 3 | Weighted Average | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.1496 0.1513
Debt | Level 3 | Weighted Average | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0246 0.0466
Equity/Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 45,835 $ 36,367
Equity/Other | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 41,946 32,937
Equity/Other | Level 3 | Equity Funds One | Recent Transaction    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] 183 20,327
Equity/Other | Level 3 | Equity Funds Two | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] $ 28,141 $ 6,401
Equity/Other | Level 3 | Equity Funds Two | Minimum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0009 0.0009
Equity/Other | Level 3 | Equity Funds Two | Maximum | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.095 0.0825
Equity/Other | Level 3 | Equity Funds Two | Weighted Average | Market Approach | Earnings Multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.0323 0.0667
Equity/Other | Level 3 | Equity Funds Three | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] $ 6,629 $ 6,155
Equity/Other | Level 3 | Equity Funds Three | Minimum | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0 0
Equity/Other | Level 3 | Equity Funds Three | Maximum | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.65 0.65
Equity/Other | Level 3 | Equity Funds Three | Weighted Average | Insurance Industry Model | Estimated Losses    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.325 0.325
Equity/Other | Level 3 | Equity Funds Four | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1] $ 6,908  
Equity/Other | Level 3 | Equity Funds Four | Asset Recovery Liquidation Valuation Technique    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value [1],[3] $ 85 $ 54
Equity/Other | Level 3 | Equity Funds Four | Minimum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.175  
Equity/Other | Level 3 | Equity Funds Four | Maximum | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.195  
Equity/Other | Level 3 | Equity Funds Four | Weighted Average | Income Approach | Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Range (Weighted Average) [1],[2] 0.185  
[1] The fair value of any one instrument may be determined using multiple valuation techniques or unobservable inputs.
[2] Weighted average for an asset category consisting of multiple investments is calculated by weighting the significant unobservable input by the relative fair value of the investment. The range and weighted average for an asset category consisting of a single investment represents the significant unobservable input used in the fair value of the investment.
[3] Investments valued using the asset recovery or liquidation technique include investments for which valuation is based on current financial data without a discount rate applied.