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Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fixed Maturities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Realized Gains | $ 2.4 | $ 2.7 | $ 7.3 | $ 14.1
Realized Losses | 0.0 | (0.8) | (0.4) | (1.1)
Equity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Realized Gains | 3.9 | 9.3 | 31.1 | 9.8
Realized Losses | $ 0.0 | $ 0.0 | $ 0.0 | $ (0.1)

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + 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=73527792&loc=d3e27357-111563 + Details
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- Definition Amount of loss realized on the sale of debt or equity securities classified as available-for-sale. Excludes other than temporary impairments (OTTI). + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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