Insurance Reserves and Policyholder Funds, Average Historical Claims Duration (Details)	Dec. 31, 2017
Medicare Supplement Insurance [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	83.70%
2nd Year	16.40%
3rd Year	0.10%
4th Year	(0.10%)
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	32.80%
2nd Year	29.40%
3rd Year	17.10%
4th Year	12.30%
5th Year	4.30%
6th Year	1.80%
7th Year	0.50%
8th Year	0.40%
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	86.00%
2nd Year	13.00%
3rd Year	(0.60%)
4th Year	1.10%
5th Year	0.00%
General Liability [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	17.70%
2nd Year	18.80%
3rd Year	16.20%
4th Year	14.30%
5th Year	10.90%
6th Year	5.40%
7th Year	6.60%
8th Year	2.40%
9th Year	2.00%
10th Year	6.70%
Surety [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) [Abstract]
1st Year	32.20%
2nd Year	34.20%
3rd Year	19.60%
4th Year	11.00%
5th Year	2.00%
6th Year	3.90%
7th Year	0.50%
8th Year	5.70%
9th Year	0.00%
10th Year	0.00%

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4G
-URI http://asc.fasb.org/extlink&oid=65670685&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.

+ 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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