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Investments (Narrative) (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) Securities | Sep. 30, 2017 USD ($) | Dec. 31, 2017 Securities
Investments [Abstract] |  |  |
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations | 97.00% |  | 97.00%
Number of individual securities with unrealized losses | Securities | 2,630 |  | 955
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 93.00% |  | 83.00%
Proceeds from sales of available for sale securities | $ 1,800.0 | $ 496.1 |
Scheduled principal repayments, calls and tenders for available for sale securities | $ 997.6 | $ 837.7 |

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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 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 + Details
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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 + Details
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