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Fair value measurements - Schedule of Realized and Unrealized Gains From Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | $ (3,386) | $ 226
Unrealized gain/(loss) on investments | 11,776 | (8,449)
Asset Management |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | 418 | 338
Unrealized gain/(loss) on investments | 1,603 | (1,869)
Net gains (losses) from investment activities | 2,021 | (1,531)
Asset Management | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unrealized gain/(loss) on investments | 1,339 | (296)
Net gains (losses) from investment activities | 1,339 | (296)
Asset Management | Debt obligation | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unrealized gain/(loss) on investments | 1,339 | (296)
Net gains (losses) from investment activities | 1,339 | (296)
Insurance Solutions | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (2,869) | 133
Unrealized gain/(loss) on investments | 11,197 | (4,546)
Net gains (losses) from investment activities | 8,328 | (4,413)
Insurance Solutions | Variable Interest Entity, Primary Beneficiary |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (386) | 107
Unrealized gain/(loss) on investments | (2,015) | (3,177)
Net gains (losses) from investment activities | (2,401) | (3,070)
Insurance Solutions | Variable Interest Entity, Primary Beneficiary | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (386) | 107
Unrealized gain/(loss) on investments | (2,015) | (3,177)
Net gains (losses) from investment activities | (2,401) | (3,070)
Insurance Solutions | Consolidated Balance Including Variable Interest Entity |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (3,809) | (112)
Unrealized gain/(loss) on investments | 11,549 | (6,938)
Net gains (losses) from investment activities | 3,816 | (11,281)
Insurance Solutions | Consolidated Balance Including Variable Interest Entity | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (3,255) | 240
Unrealized gain/(loss) on investments | 9,182 | (7,723)
Net gains (losses) from investment activities | 5,927 | (7,483)
Insurance Solutions | Corporate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (1,773) | (165)
Unrealized gain/(loss) on investments | 5,023 | (3,710)
Net gains (losses) from investment activities | 3,250 | (3,875)
Insurance Solutions | Corporate | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (1,815) |
Unrealized gain/(loss) on investments | 5,023 | (3,710)
Net gains (losses) from investment activities | 3,208 | (3,710)
Insurance Solutions | U.S. state, territories and municipalities | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unrealized gain/(loss) on investments | 51 | (10)
Net gains (losses) from investment activities | 51 | (10)
Insurance Solutions | Other government and agency |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | 0 | 0
Unrealized gain/(loss) on investments | 115 | (18)
Net gains (losses) from investment activities | 115 | (18)
Insurance Solutions | Other government and agency | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unrealized gain/(loss) on investments | 115 | (18)
Net gains (losses) from investment activities | 115 | (18)
Insurance Solutions | Asset and mortgage-backed securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (641) | (158)
Unrealized gain/(loss) on investments | 117 | 4,041
Net gains (losses) from investment activities | (524) | 3,883
Insurance Solutions | Asset and mortgage-backed securities | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (295) | 21
Unrealized gain/(loss) on investments | 117 | 4,041
Net gains (losses) from investment activities | (178) | 4,062
Insurance Solutions | Corporate loans |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (4) | 110
Unrealized gain/(loss) on investments | 1,853 | (594)
Net gains (losses) from investment activities | 1,849 | (484)
Insurance Solutions | Corporate loans | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (4) | 110
Unrealized gain/(loss) on investments | 1,853 | (594)
Net gains (losses) from investment activities | 1,849 | (484)
Insurance Solutions | Other invested assets | Fair value option |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Realized gain/(loss) on investments | (755) | 2
Unrealized gain/(loss) on investments | 4,038 | (4,255)
Net gains (losses) from investment activities | $ 3,283 | $ (4,253)

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