v3.26.1
Fair value measurements - Schedule of Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments $ 1,106,786 $ 1,062,824
Insurance Solutions | Variable Interest Entity, Primary Beneficiary    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 120,680 125,898
Insurance Solutions | Consolidated Balance Including Variable Interest Entity    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 1,077,488 1,041,454
Other than Fair Value Measurement | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance 126,711 123,579
Other than Fair Value Measurement | Insurance Solutions | Variable Interest Entity, Primary Beneficiary    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance 127,620 132,194
Other than Fair Value Measurement | Insurance Solutions | Consolidated Balance Including Variable Interest Entity    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance 254,331 255,773
Mark to Fair Value | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance (1,534) (7,902)
Mark to Fair Value | Insurance Solutions | Variable Interest Entity, Primary Beneficiary    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance (7,889) (6,296)
Mark to Fair Value | Insurance Solutions | Consolidated Balance Including Variable Interest Entity    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance (9,423) (14,198)
Fair value | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 125,177 115,677
Fair value | Insurance Solutions | Variable Interest Entity, Primary Beneficiary    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 119,731 125,898
Fair value | Insurance Solutions | Consolidated Balance Including Variable Interest Entity    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 244,908 241,575
Corporate loans | Variable Interest Entity, Primary Beneficiary    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 119,731 125,757
Corporate loans | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 124,067 114,735
Corporate loans | Other than Fair Value Measurement | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance 125,422 117,823
Corporate loans | Mark to Fair Value | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance (1,355) (3,089)
Corporate loans | Fair value | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 124,067 114,734
Other invested assets | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments 23,084 21,317
Other invested assets | Other than Fair Value Measurement | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance 1,289 5,756
Other invested assets | Mark to Fair Value | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unpaid Principal Balance (179) (4,813)
Other invested assets | Fair value | Insurance Solutions    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Investments $ 1,110 $ 943