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Investments (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) Securities	Jun. 30, 2017 USD ($)	Dec. 31, 2017 Securities
Investments [Abstract]
Fixed income securities with call features, percentage	36.00%
Fixed income securities with call features, currently callable, percentage	2.70%
Fixed income securities with call features, currently callable, amount	$ 1,200.0
Fixed income securities with call features, callable during next 12 months, percentage	0.40%
Fixed income securities with call features, callable during next 12 months, amount	$ 168.9
Fixed income securities with call features, not callable until within 6 months of stated maturity, percentage	73.00%
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations	97.00%		97.00%
Number of individual securities with unrealized losses | Securities	2,380		955
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	91.00%		83.00%
Proceeds from sales of available for sale securities	$ 1,700.0	$ 376.9
Scheduled principal repayments, calls and tenders for available for sale securities	$ 635.2	$ 593.8

X

- Definition

Represents the percentage of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are callable over the next 12 months.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are currently callable.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date).

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are callable during the next 12 months.

+ References

No definition available.

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- Definition

Represents the amount of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are currently callable.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are not callable until within 6 months of their stated maturities.

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

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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.

+ Details

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- Definition

The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

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- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562

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