Other Insurance Reserves and Policyholder Funds - Supplementary Information about Average Historical Claims Duration (Details)	Dec. 31, 2025
Medicare Supplement [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
1st Year	80.50%
2nd Year	18.10%
3rd Year	0.30%
4th Year	0.00%
5th Year	0.00%
6th Year	0.00%
7th Year	0.00%
8th Year	0.00%
9th Year	0.00%
10th Year	0.00%
4th Year	0.00%
5th Year	0.00%
6th Year	0.00%
7th Year	0.00%
8th Year	0.00%
9th Year	0.00%
10th Year	0.00%
Automobile Liability [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
1st Year	24.60%
2nd Year	29.40%
3rd Year	17.60%
4th Year	14.20%
5th Year	8.50%
6th Year	3.80%
7th Year	2.50%
8th Year	0.60%
9th Year	0.00%
10th Year	0.00%
4th Year	(14.20%)
5th Year	(8.50%)
6th Year	(3.80%)
7th Year	(2.50%)
8th Year	(0.60%)
9th Year	0.00%
10th Year	0.00%
Automobile Physical Damage [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
1st Year	80.30%
2nd Year	16.90%
3rd Year	0.00%
4th Year	0.40%
5th Year	0.10%
6th Year	0.00%
7th Year	0.00%
8th Year	0.00%
9th Year	0.00%
10th Year	0.00%
4th Year	(0.40%)
5th Year	(0.10%)
6th Year	0.00%
7th Year	0.00%
8th Year	0.00%
9th Year	0.00%
10th Year	0.00%
General Liability [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
1st Year	18.10%
2nd Year	23.60%
3rd Year	24.40%
4th Year	16.90%
5th Year	12.90%
6th Year	3.30%
7th Year	4.10%
8th Year	0.00%
9th Year	0.00%
10th Year	0.00%
4th Year	(16.90%)
5th Year	(12.90%)
6th Year	(3.30%)
7th Year	(4.10%)
8th Year	0.00%
9th Year	0.00%
10th Year	0.00%
Surety [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
1st Year	46.90%
2nd Year	51.60%
3rd Year	10.30%
4th Year	11.70%
5th Year	7.20%
6th Year	3.00%
7th Year	1.00%
8th Year	0.10%
9th Year	0.30%
10th Year	0.40%
4th Year	(11.70%)
5th Year	(7.20%)
6th Year	(3.00%)
7th Year	(1.00%)
8th Year	(0.10%)
9th Year	(0.30%)
10th Year	(0.40%)

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.

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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

+ 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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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.

+ References

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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.

+ References

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- Definition

Percentage of average annual payout, after reinsurance, in the tenth 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

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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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