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Business Segments - Segment Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations | $ 29.1 | $ (18.3) | $ 4.1 | $ (2.2) | $ 1.3 | $ 38.0 | $ 27.4 | $ 13.5 | $ 12.7 | $ 80.2 | $ 112.6
Net Operating Income |  |  |  |  |  |  |  |  | 12.4 | 69.9 | 97.1
Income (Loss) from Continuing Operations |  |  |  |  |  |  |  |  | 12.7 | 80.2 | 112.6
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Operating Income |  |  |  |  |  |  |  |  | 27.4 | 98.4 | 116.7
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations |  |  |  |  |  |  |  |  | (2.9) | 26.7 |
Net Operating Income |  |  |  |  |  |  |  |  |  |  | 24.9
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations |  |  |  |  |  |  |  |  | 30.3 | 71.7 |
Net Operating Income |  |  |  |  |  |  |  |  |  |  | 91.8
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Operating Income |  |  |  |  |  |  |  |  | (15.0) | (28.5) | (19.6)
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Realized Gains on Sales of Investments |  |  |  |  |  |  |  |  | 21.5 | 33.9 | 25.4
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | (21.2) | (17.7) | (9.9)
Loss from Early Extinguishment of Debt |  |  |  |  |  |  |  |  | $ 0.0 | $ (5.9) | $ 0.0

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