v3.26.1
Fair value measurements - Schedule of Gains Losses From Credit Risks (Details) - Insurance Solutions - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, option, changes in fair value, gain (loss) $ 52 $ 4,607
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) 18 1,136
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) 34 3,471
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) (336) (909)
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) $ (284) $ 3,698