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Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) states	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Number of states in which entity is licensed to sell insurance products | states		50
Number of days past due, non-accrual status		90 days
Minimum [Member]
Interest crediting rate, range for fixed index annuities and other deferred annuity products		1.00%	1.00%	1.00%
Maximum [Member]
Interest crediting rate, range for fixed index annuities and other deferred annuity products		3.30%	3.30%	3.30%
Maximum [Member] | Cash and Cash Equivalents [Member]
Investment maturity period (less than)		3 months
Accounting Standards Update 2016-09 [Member]
New accounting pronouncement, effect of adoption, quantification		$ 2.8
Forecast [Member] | Accounting Standards Update 2018-02 [Member]
New accounting pronouncement, effect of adoption, quantification	$ 128.0

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- Definition

Investment maturity period.

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- Definition

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+ References

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- Definition

The number of states in which the entity is licensed to sell insurance products.

+ References

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- Definition

Rate of interest credited to policyholder deposits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.13(b))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439

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- Definition

Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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