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Future policy benefits and related reinsurance recoverable - Schedule of Weighted-Average Interest Rate For Future Policy Benefits (Details) - Long term care reinsurance | Dec. 31, 2025 | Dec. 31, 2024
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Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted-average duration of liability (years) at current rate | 10 years 1 month 6 days | 10 years 3 months 7 days
Weighted-average duration of liability (years) at original rate | 11 years 11 months 4 days | 12 years 5 months 8 days
Weighted-average interest rate at current rate | 5.04% | 5.26%
Weighted-average interest rate at original rate | 3.13% | 3.05%

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- Definition Weighted-average duration of present value of total expected payment to policyholder in excess of present value of total expected assessment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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