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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

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