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Fair value measurements - Schedule Of Gains Losses From Credit Risks (Details) - Insurance Solutions - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ 4,751 | $ (4,178)
Corporate loans |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 1,200 | 75
Other invested assets |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 3,551 | (4,253)
Variable Interest Entity, Primary Beneficiary |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (915) | (863)
Consolidated Balance Including Variable Interest Entity |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ 3,836 | $ (5,041)

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