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Short-Duration Insurance Contracts - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Automobile liability coverage percent reserves | 68.00% |  |
Annual percentage payout as a percent of property & casualty incurred losses (as a percent) | 94.00% |  |
Potential variability of property and casualty loss reserves | 1.00% |  |
Probability of other possible outcomes possible impact on net income | $ 2.5 |  |
Sensitivity analysis, hypothetical change in loss ratio, percent | 1.00% |  |
Sensitivity analysis, hypothetical change in loss ratio, amount | $ 0.8 |  |
Property & Casualty |  |  |
Segment Reporting Information [Line Items] |  |  |
Favorable (unfavorable) development of total reserves for claims occurring in prior years, net | 11.8 | $ 0.0 | $ (22.0)
Unfavorable development of total reserves for claims occurring in prior years |  |  | (28.0)
Favorable loss trends in auto and homeowners | 29.5 |  |
Favorable development of total reserves recognition of loss reserves for legacy commercial lines | 17.7 |  |
Favorable development of total reserves for claims occurring in prior years |  |  | $ 6.0
Group benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Favorable (unfavorable) development of total reserves for claims occurring in prior years, net | $ 14.5 | $ 13.9 |

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- Definition Automobile liability coverage reserves as a percentage of total reserves. + References No definition available. + Details
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- Definition Favorable Development Of Total Reserves For Claims Occurring In Prior Years + References No definition available. + Details
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- Definition Recognition Of Loss Reserves For Legacy Commercial Lines + References No definition available. + Details
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- Definition Favorable Loss Trends In Auto And Homeowners + References No definition available. + Details
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- Definition The reduction in the estimate of the amount needed to settle claims relating to property and casualty insured events that have occurred in prior years. + References No definition available. + Details
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- Definition Liability For Claims, Sensitivity Analysis, Hypothetical Change In Loss Ratio, Amount + References No definition available. + Details
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- Definition Liability For Claims, Sensitivity Analysis, Hypothetical Change In Loss Ratio, Percent + References No definition available. + Details
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- Definition Potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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- Definition Equated Net Income impact (plus or minus) of potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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- Definition Short-Duration Insurance Contracts, Historical Claims Duration, As A Percent of Property and Casualty Incurred Losses + References No definition available. + Details
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- Definition Unfavorable Development Of Total Reserves For Claims Occurring In Prior Years + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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