Unpaid Losses and Loss Adjustment Expenses - Loss Duration (Details)	Dec. 31, 2023
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	29.20%
Year 2	21.30%
Year 3	18.20%
Year 4	12.40%
Year 5	8.90%
Year 6	4.70%
Year 7	2.80%
Year 8	1.40%
Year 9	0.70%
Year 10, and onwards	0.40%
Commercial Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	27.30%
Year 2	21.60%
Year 3	18.60%
Year 4	12.80%
Year 5	9.20%
Year 6	4.90%
Year 7	2.90%
Year 8	1.50%
Year 9	0.70%
Year 10, and onwards	0.50%
Personal Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	83.10%
Year 2	11.30%
Year 3	5.30%
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

No definition available.

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-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

+ Details

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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

+ Details

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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

+ Details

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- Definition

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.

+ References

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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

+ Details

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- Definition

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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