Insurance Reserves and Policyholder Funds, Average Historical Claims Duration (Details)	Dec. 31, 2020
Medicare Supplement [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	83.00%
2nd Year	16.90%
3rd Year	0.10%
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	29.10%
2nd Year	30.90%
3rd Year	17.30%
4th Year	12.70%
5th Year	5.80%
6th Year	2.10%
7th Year	0.40%
8th Year	0.50%
9th Year	0.00%
10th Year	0.00%
Automobile Physical Damage [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	85.40%
2nd Year	14.20%
3rd Year	(0.60%)
4th Year	(0.40%)
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	17.80%
2nd Year	17.80%
3rd Year	22.50%
4th Year	16.90%
5th Year	8.40%
6th Year	6.30%
7th Year	2.80%
8th Year	2.20%
9th Year	1.70%
10th Year	6.60%
Surety [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	41.20%
2nd Year	31.10%
3rd Year	10.50%
4th Year	9.80%
5th Year	(1.30%)
6th Year	1.80%
7th Year	0.30%
8th Year	0.20%
9th Year	0.20%
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.

+ 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.

+ 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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- 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

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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.

+ 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.

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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.

+ References

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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.

+ 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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