Unpaid Losses and Loss Adjustment Expenses - Loss Duration (Details)	Dec. 31, 2021
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	40.80%
Year 2	26.30%
Year 3	17.10%
Year 4	8.60%
Year 5	4.00%
Year 6	2.30%
Year 7	0.60%
Year 8	0.20%
Year 9	0.10%
Year 10, and onwards	0.00%
Commercial Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	40.60%
Year 2	26.40%
Year 3	17.20%
Year 4	8.50%
Year 5	4.10%
Year 6	2.30%
Year 7	0.60%
Year 8	0.20%
Year 9	0.10%
Year 10, and onwards	0.00%
Personal Lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	47.60%
Year 2	23.50%
Year 3	15.60%
Year 4	11.90%
Year 5	1.00%
Year 6	0.30%
Year 7	0.00%
Year 8	0.10%
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4G
-URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438

+ Details

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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

+ Details

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