Future Policy Benefits and Claims - Additional Liability for Certain Benefit Features (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Changes in the additional liability for certain benefit features | ||
| Balance at end of period | $ 6,876.4 | $ 6,604.8 |
| Benefits and Protection | Life Insurance | Universal life | ||
| Changes in the additional liability for certain benefit features | ||
| Balance at beginning of period | 6,604.8 | 6,037.2 |
| Effect of changes in cash flow assumptions | 0.0 | 6.8 |
| Effect of actual variances from expected experience | 35.2 | 18.5 |
| Interest accrual | 150.3 | 282.4 |
| Net assessments collected | 214.2 | 430.6 |
| Benefit payments | (128.1) | (170.7) |
| Balance at end of period | 6,876.4 | 6,604.8 |
| Reinsurance impact | (6,865.4) | (6,593.6) |
| Balance at end of period after reinsurance | $ 11.0 | $ 11.2 |
| Weighted-average duration for additional liability (in years) | 20 years 9 months 18 days | 21 years 7 months 6 days |
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- Definition Amount recoverable under reinsurance for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. No definition available.
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- Definition Amount, after effect of reinsurance, of present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cash outflow to policyholder related to benefit payment for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cumulative increase (decrease) in present value of total expected payment to policyholder in excess of present value of total expected assessment from cash flow assumption change for future cash flows. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cumulative increase (decrease) in present value of total expected payment to policyholder in excess of present value of total expected assessment from effect of variance from cash flow assumption change for actual experience. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of interest income (expense) for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of gross premium collected from policyholder to fund expected benefit payment for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, before effect of reinsurance and current period update of cash flow assumption, of present value of total expected payment to policyholder in excess of present value of total expected assessment, discounted at original rate. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption, of present value of total expected payment to policyholder in excess of present value of total expected assessment, discounted at original rate. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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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 reported fact of one year, five months, and thirteen days. Excludes benefit classified as market risk benefit or under provision of Topic 815 on derivative and hedging. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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