Insurance Reserves and Policyholder Funds, Average Historical Claims Duration (Details)	Dec. 31, 2024
Medicare Supplement [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Subrogation and Reinsurance (unaudited) [Abstract]
1st Year	80.90%
2nd Year	17.80%
3rd Year	0.20%
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]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Subrogation and Reinsurance (unaudited) [Abstract]
1st Year	25.80%
2nd Year	29.60%
3rd Year	17.30%
4th Year	13.80%
5th Year	9.60%
6th Year	4.30%
7th Year	2.80%
8th Year	0.30%
9th Year	0.30%
10th Year	0.00%
Automobile Physical Damage [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Subrogation and Reinsurance (unaudited) [Abstract]
1st Year	83.20%
2nd Year	14.50%
3rd Year	0.60%
4th Year	0.10%
5th Year	(0.20%)
6th Year	0.00%
7th Year	0.00%
8th Year	0.00%
9th Year	0.00%
10th Year	0.00%
General Liability [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Subrogation and Reinsurance (unaudited) [Abstract]
1st Year	16.80%
2nd Year	20.00%
3rd Year	21.50%
4th Year	17.30%
5th Year	14.60%
6th Year	2.20%
7th Year	1.50%
8th Year	0.00%
9th Year	0.00%
10th Year	0.10%
Surety [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Subrogation and Reinsurance (unaudited) [Abstract]
1st Year	48.50%
2nd Year	49.50%
3rd Year	13.20%
4th Year	11.40%
5th Year	(7.10%)
6th Year	(0.70%)
7th Year	(0.10%)
8th Year	0.00%
9th Year	(0.20%)
10th Year	0.00%

No definition available.

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

+ References

No definition available.

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

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No definition available.

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Percentage of average annual payout, after reinsurance and recoveries, 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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No definition available.

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

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No definition available.

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Percentage of average annual payout, after reinsurance and recoveries, 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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No definition available.

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

+ References

No definition available.

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

+ References

No definition available.

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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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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.

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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.

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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.

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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.

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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.

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