Insurance Reserves and Policyholder Funds, Average Historical Claims Duration (Details)	Dec. 31, 2018
Medicare Supplement [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	83.50%
2nd Year	16.50%
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	31.50%
2nd Year	30.30%
3rd Year	17.20%
4th Year	12.90%
5th Year	4.40%
6th Year	1.70%
7th Year	0.50%
8th Year	0.70%
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	86.20%
2nd Year	12.80%
3rd Year	(0.50%)
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%
General Liability [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	18.50%
2nd Year	19.30%
3rd Year	20.60%
4th Year	16.20%
5th Year	10.00%
6th Year	5.00%
7th Year	4.70%
8th Year	1.50%
9th Year	1.10%
10th Year	3.40%
Surety [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	34.60%
2nd Year	34.10%
3rd Year	15.30%
4th Year	11.30%
5th Year	0.90%
6th Year	3.30%
7th Year	0.50%
8th Year	6.30%
9th Year	0.00%
10th Year	(1.70%)

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=99384497&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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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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- 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

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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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