Unpaid Losses and Loss Adjustment Expenses - Loss Duration (Details)	Dec. 31, 2025
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	38.20%
Year 2	22.00%
Year 3	17.00%
Year 4	11.70%
Year 5	8.50%
Year 6	2.20%
Year 7	0.30%
Year 8	0.10%
Year 9	0.00%
Year 10, and onwards	0.00%
Commercial Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	35.80%
Year 2	22.30%
Year 3	17.60%
Year 4	12.50%
Year 5	9.10%
Year 6	2.30%
Year 7	0.30%
Year 8	0.10%
Year 9	0.00%
Year 10, and onwards	0.00%
Personal Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	72.70%
Year 2	17.50%
Year 3	9.00%
Year 4	0.70%
Year 5	0.10%
Year 6	0.00%
Year 7	0.00%
Year 8	0.00%
Year 9	0.00%
Year 10, and onwards	0.00%

Short-duration insurance contracts, historical claims duration, year ten and thereafter.

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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

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- Definition

Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 9F
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-9F

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-4G

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- Definition

Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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- Definition

Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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