v3.26.1
Fair value measurements - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Financial assets      
Level 3 Assets fair value $ 282,270 $ 257,265 $ 246,847
Financial liabilities      
Total financial liabilities   1,471  
Variable Interest Entity, Primary Beneficiary      
Financial assets      
Level 3 Assets fair value 120,680 125,898  
Consolidated Balance Including Variable Interest Entity      
Financial assets      
Level 3 Assets fair value 275,701 256,766 245,177
Asset Management      
Financial assets      
Level 3 Assets fair value 6,569 499 1,670
Financial liabilities      
Debt obligation   1,471  
Total financial liabilities 0 1,471 1,175
Insurance Solutions      
Financial assets      
Debt securities: 405,621 388,907  
Level 3 Assets fair value 155,021 130,868 $ 120,540
Insurance Solutions | Corporate      
Financial assets      
Debt securities: 166,693 119,896  
Insurance Solutions | Asset and mortgage-backed securities      
Financial assets      
Debt securities: 221,524 253,934  
Insurance Solutions | Consolidated Balance Including Variable Interest Entity      
Financial assets      
Level 3 Assets fair value 275,701 256,766  
Discounted cash flow      
Financial assets      
Other invested assets 5,637    
Discounted cash flow | Asset Management      
Financial assets      
Equity securities   30  
Discounted cash flow | Insurance Solutions      
Financial assets      
Equity securities 3,000 2,918  
Debt securities:   8,588  
Corporate loans 116,568 113,062  
Other invested assets   $ 4,575  
Discounted cash flow | Insurance Solutions | Corporate      
Financial assets      
Debt securities: 10,149    
Discounted cash flow | Insurance Solutions | Asset and mortgage-backed securities      
Financial assets      
Debt securities: 19,427    
Discounted cash flow | Insurance Solutions | Minimum      
Financial assets      
Corporate loans, measurement input   0.036  
Discounted cash flow | Insurance Solutions | Maximum      
Financial assets      
Corporate loans, measurement input   0.175  
Discounted cash flow | Insurance Solutions | Weighted Average      
Financial assets      
Corporate loans, measurement input   0.106  
Discounted cash flow | Insurance Solutions | Variable Interest Entity, Primary Beneficiary      
Financial assets      
Equity securities   $ 141  
Corporate loans $ 89,608 $ 75,172  
Discounted cash flow | Discount rate | Asset Management | Minimum      
Financial assets      
Equity securities, measurement input   0.220  
Discounted cash flow | Discount rate | Asset Management | Maximum      
Financial assets      
Equity securities, measurement input   0.270  
Discounted cash flow | Discount rate | Asset Management | Weighted Average      
Financial assets      
Equity securities, measurement input   0.245  
Discounted cash flow | Discount rate | Insurance Solutions | Minimum      
Financial assets      
Equity securities, measurement input 0.0561 0.101  
Debt securities, measurement input   0.057  
Corporate loans, measurement input 0    
Other invested assets , measurement input 9.57% 14.90%  
Discounted cash flow | Discount rate | Insurance Solutions | Minimum | Corporate      
Financial assets      
Debt securities, measurement input 0.0736    
Discounted cash flow | Discount rate | Insurance Solutions | Minimum | Asset and mortgage-backed securities      
Financial assets      
Debt securities, measurement input 0.0629    
Discounted cash flow | Discount rate | Insurance Solutions | Maximum      
Financial assets      
Equity securities, measurement input 0.0561 0.101  
Debt securities, measurement input   0.093  
Corporate loans, measurement input 0.1569    
Other invested assets , measurement input 19.72% 19.30%  
Discounted cash flow | Discount rate | Insurance Solutions | Maximum | Corporate      
Financial assets      
Debt securities, measurement input 0.0892    
Discounted cash flow | Discount rate | Insurance Solutions | Maximum | Asset and mortgage-backed securities      
Financial assets      
Debt securities, measurement input 0.0853    
Discounted cash flow | Discount rate | Insurance Solutions | Weighted Average      
Financial assets      
Equity securities, measurement input 0.0561 0.101  
Debt securities, measurement input   0.080  
Corporate loans, measurement input 0.0816    
Other invested assets , measurement input 16.87% 18.40%  
Discounted cash flow | Discount rate | Insurance Solutions | Weighted Average | Corporate      
Financial assets      
Debt securities, measurement input 0.0814    
Discounted cash flow | Discount rate | Insurance Solutions | Weighted Average | Asset and mortgage-backed securities      
Financial assets      
Debt securities, measurement input 0.0755    
Discounted cash flow | Discount rate | Insurance Solutions | Variable Interest Entity, Primary Beneficiary | Minimum      
Financial assets      
Equity securities, measurement input   0.1437  
Corporate loans, measurement input 0.0526 0.043  
Discounted cash flow | Discount rate | Insurance Solutions | Variable Interest Entity, Primary Beneficiary | Maximum      
Financial assets      
Equity securities, measurement input   0.1437  
Corporate loans, measurement input 0.1483 0.171  
Discounted cash flow | Discount rate | Insurance Solutions | Variable Interest Entity, Primary Beneficiary | Weighted Average      
Financial assets      
Equity securities, measurement input   0.1437  
Corporate loans, measurement input 0.0963 0.067  
Enterprise value | Asset Management      
Financial assets      
Equity securities $ 6,409 $ 469  
Financial liabilities      
Debt obligation   1,471  
Enterprise value | Insurance Solutions      
Financial assets      
Equity securities 210    
Corporate loans   $ 1,672  
Enterprise value | Insurance Solutions | Variable Interest Entity, Primary Beneficiary      
Financial assets      
Equity securities $ 949    
Enterprise value | Discount rate | Insurance Solutions | Variable Interest Entity, Primary Beneficiary | Minimum      
Financial assets      
Equity securities, measurement input 10    
Enterprise value | Discount rate | Insurance Solutions | Variable Interest Entity, Primary Beneficiary | Maximum      
Financial assets      
Equity securities, measurement input 16    
Enterprise value | Discount rate | Insurance Solutions | Variable Interest Entity, Primary Beneficiary | Weighted Average      
Financial assets      
Equity securities, measurement input 13    
Enterprise value | Enterprise Value, Multiple | Asset Management | Minimum      
Financial assets      
Equity securities, measurement input 12.5 5.13  
Enterprise value | Enterprise Value, Multiple | Asset Management | Maximum      
Financial assets      
Equity securities, measurement input 13.5 6.13  
Enterprise value | Enterprise Value, Multiple | Asset Management | Weighted Average      
Financial assets      
Equity securities, measurement input 13 5.63  
Enterprise value | Enterprise Value, Multiple | Insurance Solutions | Minimum      
Financial assets      
Equity securities, measurement input 0.63    
Corporate loans, measurement input   0.3  
Enterprise value | Enterprise Value, Multiple | Insurance Solutions | Maximum      
Financial assets      
Equity securities, measurement input 0.63    
Corporate loans, measurement input   8.25  
Enterprise value | Enterprise Value, Multiple | Insurance Solutions | Weighted Average      
Financial assets      
Equity securities, measurement input 0.63    
Corporate loans, measurement input   8.04  
Recent transaction | Insurance Solutions      
Financial assets      
Equity securities $ 30    
Debt securities:   $ 53  
Recent transaction | Insurance Solutions | Variable Interest Entity, Primary Beneficiary      
Financial assets      
Corporate loans 30,123 $ 50,585  
Market approach | Asset Management      
Financial assets      
Equity securities 75    
Option pricing model | Asset Management      
Financial assets      
Equity securities $ 13    
Option pricing model | Valuation Technique, Volatility | Asset Management | Minimum      
Financial assets      
Equity securities, measurement input 1.1620    
Option pricing model | Valuation Technique, Volatility | Asset Management | Maximum      
Financial assets      
Equity securities, measurement input 1.2620    
Option pricing model | Valuation Technique, Volatility | Asset Management | Weighted Average      
Financial assets      
Equity securities, measurement input 1.2120    
Option Pricing Model Years To Exercise | Valuation Technique, Years To Exercise | Asset Management | Minimum      
Financial assets      
Equity securities, measurement input 0.1    
Option Pricing Model Years To Exercise | Valuation Technique, Years To Exercise | Asset Management | Maximum      
Financial assets      
Equity securities, measurement input 0.3    
Option Pricing Model Years To Exercise | Valuation Technique, Years To Exercise | Asset Management | Weighted Average      
Financial assets      
Equity securities, measurement input 0.2    
Probability-Weighted Expected Return Method | Asset Management      
Financial assets      
Other invested assets $ 72    
Probability-Weighted Expected Return Method | Independent probabilities | Asset Management | Minimum      
Financial assets      
Other invested assets , measurement input 5.00%    
Probability-Weighted Expected Return Method | Independent probabilities | Asset Management | Maximum      
Financial assets      
Other invested assets , measurement input 5.00%    
Probability-Weighted Expected Return Method | Independent probabilities | Asset Management | Weighted Average      
Financial assets      
Other invested assets , measurement input 5.00%    
Probability-Weighted Expected Return Method Dependent Probabilities | Dependent Probabilities | Asset Management | Minimum      
Financial assets      
Other invested assets , measurement input 2.40%    
Probability-Weighted Expected Return Method Dependent Probabilities | Dependent Probabilities | Asset Management | Maximum      
Financial assets      
Other invested assets , measurement input 3.70%    
Probability-Weighted Expected Return Method Dependent Probabilities | Dependent Probabilities | Asset Management | Weighted Average      
Financial assets      
Other invested assets , measurement input 3.10%    
Probability-Weighted Expected Return Method Years To Cash Flows | Years To Cash Flows | Asset Management | Minimum      
Financial assets      
Other invested assets , measurement input 250.00%    
Probability-Weighted Expected Return Method Years To Cash Flows | Years To Cash Flows | Asset Management | Maximum      
Financial assets      
Other invested assets , measurement input 450.00%    
Probability-Weighted Expected Return Method Years To Cash Flows | Years To Cash Flows | Asset Management | Weighted Average      
Financial assets      
Other invested assets , measurement input 350.00%