Insurance Reserves and Policyholder Funds, Average Historical Claims Duration (Details)	Dec. 31, 2023
Medicare Supplement [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	81.90%
2nd Year	17.10%
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 Reinsurance (unaudited) [Abstract]
1st Year	26.90%
2nd Year	29.80%
3rd Year	17.30%
4th Year	12.60%
5th Year	8.30%
6th Year	3.30%
7th Year	1.90%
8th Year	0.20%
9th Year	0.70%
10th Year	0.60%
Automobile Physical Damage [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	83.50%
2nd Year	16.10%
3rd Year	(0.30%)
4th Year	(0.30%)
5th Year	0.00%
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 Reinsurance (unaudited) [Abstract]
1st Year	21.90%
2nd Year	22.20%
3rd Year	21.20%
4th Year	14.60%
5th Year	13.10%
6th Year	5.70%
7th Year	1.40%
8th Year	0.20%
9th Year	0.00%
10th Year	0.60%
Surety [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	50.40%
2nd Year	41.50%
3rd Year	14.50%
4th Year	(10.60%)
5th Year	(5.10%)
6th Year	(1.10%)
7th Year	(0.40%)
8th Year	0.10%
9th Year	0.10%
10th Year	0.10%

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.

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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.

+ References

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.

+ References

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.

+ References

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://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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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 fourth 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 sixth 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 tenth 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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