Unpaid Losses and Loss Adjustment Expenses - Loss Duration (Details)	Dec. 31, 2024
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	31.50%
Year 2	23.50%
Year 3	17.10%
Year 4	12.20%
Year 5	7.30%
Year 6	4.30%
Year 7	2.30%
Year 8	1.10%
Year 9	0.50%
Year 10, and onwards	0.20%
Commercial Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	29.70%
Year 2	23.90%
Year 3	17.60%
Year 4	12.70%
Year 5	7.60%
Year 6	4.40%
Year 7	2.30%
Year 8	1.10%
Year 9	0.50%
Year 10, and onwards	0.20%
Personal Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	82.20%
Year 2	12.10%
Year 3	5.40%
Year 4	0.30%
Year 5	0.00%
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.

No definition available.

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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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- Definition

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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- Definition

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.

+ References

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- Definition

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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- Definition

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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