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Investments (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) Securities	Mar. 31, 2018 USD ($)	Dec. 31, 2018 Securities
Investments [Abstract]
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations	97.00%		97.00%
Number of securities in unrealized loss position | Securities	1,471		2,715
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	81.00%		87.00%
Proceeds from sales of available for sale securities	$ 136.0	$ 85.5
Principal repayments, calls and tenders of available for sale securities	$ 150.9	$ 180.4

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- Definition

This item represents the percentage of unrealized losses on fixed maturity securities that is on securities classified as investment grade.

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- Definition

Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value.

+ References

No definition available.

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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