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Business Segments - Segment Net Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | $ 92.5 | $ 12.4 | $ 69.9
Income (Loss) from Continuing Operations | 119.9 | 12.7 | 80.2
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 98.6 | 27.4 | 98.4
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 7.8 | (2.9) | 26.7
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 90.8 | 30.3 | 71.7
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | (6.1) | (15.0) | (28.5)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) | 7.4 | 0.0 | 0.0
Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Realized Gains on Sales of Investments | 36.7 | 21.5 | 33.9
Net Impairment Losses Recognized in Earnings | (9.3) | (21.2) | (17.7)
Loss from Early Extinguishment of Debt | 0.0 | 0.0 | (5.9)
Excluding amounts attributable to Tax Law Changes [Member] | Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | $ (13.5) | $ (15.0) | $ (28.5)

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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 + Details
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