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Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2025 | Dec. 31, 2025 | Dec. 31, 2024
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | $ 30,193 | $ 55,697
Goodwill impairment |  | $ 25,504 | 0
Multi Year Guaranteed Annuities |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Reporting unit exceeded its respective carrying value percentage |  | 30.60% |
Long-Term Care |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Goodwill impairment | $ 25,500 |  |
Asset Management |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | $ 1,000 | 1,000
Insurance Solutions |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | 30,193 | 55,697
Goodwill impairment |  | 25,504 | 0
Insurance Solutions | Multi Year Guaranteed Annuities |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | 30,193 | 30,193
Goodwill impairment |  | 0 |
Insurance Solutions | Long-Term Care |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | 0 | $ 25,504
Goodwill impairment |  | $ 25,504 |

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