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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income Reclassification from AOCI to Consolidated Statements of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Realized Gains (Losses) on Sales of Investments | $ 9.1 | $ 11.6 | $ 5.6 | $ 6.8 | $ 9.4 | $ 5.3 | $ 34.0 | $ 3.4 | $ 33.1 | $ 52.1 | $ 39.1
Net Impairment Losses Recognized in Earnings | (8.7) | (8.3) | (6.4) | (9.3) | (14.7) | (3.3) | (2.2) | (7.0) | (32.7) | (27.2) | (15.2)
Interest and Other Expenses | (25.3) | (22.0) | (20.7) | (22.3) | (25.6) | (25.7) | (26.6) | (29.7) | (90.3) | (107.6) | (91.7)
Income Tax Benefit (Expense) | (11.5) | 14.9 | 1.5 | 4.3 | 2.9 | (11.8) | (6.9) | (4.3) | 9.2 | (20.1) | (47.6)
Net Income | $ 31.2 | $ (16.3) | $ 4.0 | $ (2.1) | $ 4.6 | $ 37.9 | $ 29.7 | $ 13.5 | 16.8 | 85.7 | 114.5
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | (4.1) | 1.4 | 11.2
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Realized Gains (Losses) on Sales of Investments |  |  |  |  |  |  |  |  | 32.0 | 52.6 | 37.9
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | (32.2) | (27.2) | (12.8)
Total Before Income Taxes |  |  |  |  |  |  |  |  | (0.2) | 25.4 | 25.1
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 0.1 | (8.9) | (8.8)
Net Income |  |  |  |  |  |  |  |  | (0.1) | 16.5 | 16.3
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and Other Expenses |  |  |  |  |  |  |  |  | (6.3) | (23.1) | (7.9)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 2.3 | 8.0 | 2.8
Net Income |  |  |  |  |  |  |  |  | $ (4.0) | $ (15.1) | $ (5.1)

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