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Investments (Narrative) (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) Securities | Jun. 30, 2018 USD ($) | 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 | 1,013 |  | 2,715
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 73.00% |  | 87.00%
Proceeds from sales of available for sale securities | $ 359.3 | $ 1,700.0 |
Principal repayments, calls and tenders of available for sale securities | $ 500.5 | $ 635.2 |

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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 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 + Details
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