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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Realized Gains on Sales of Investments | $ 8.1 | $ 11.6 | $ 45.0 | $ 24.0
Net Impairment Losses Recognized in Earnings | (2.9) | (8.3) | (10.5) | (24.0)
Interest and Other Expenses | (18.2) | (22.0) | (59.1) | (65.0)
Total Before Income Taxes | 68.3 | (33.2) | 116.9 | (37.1)
Income Tax Benefit (Expense) | (20.5) | 14.9 | (32.9) | 20.7
Net Income (Loss) | 47.7 | (16.3) | 84.0 | (14.4)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Income (Loss) | 2.1 | 1.6 | 17.3 | (4.5)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Realized Gains on Sales of Investments | 6.5 | 11.2 | 38.2 | 22.7
Net Impairment Losses Recognized in Earnings | (2.9) | (8.3) | (10.5) | (24.0)
Total Before Income Taxes | 3.6 | 2.9 | 27.7 | (1.3)
Income Tax Benefit (Expense) | (1.3) | (1.1) | (9.7) | 0.4
Net Income (Loss) | 2.3 | 1.8 | 18.0 | (0.9)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest and Other Expenses | 0.1 | (0.4) | 0.4 | (5.7)
Income Tax Benefit (Expense) | (0.1) | 0.2 | (0.2) | 2.1
Net Income (Loss) | 0.0 | (0.2) | 0.2 | (3.6)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest and Other Expenses | (0.2) | 0.0 | (1.3) | 0.0
Income Tax Benefit (Expense) | 0.0 | 0.0 | 0.4 | 0.0
Net Income (Loss) | $ (0.2) | $ 0.0 | $ (0.9) | $ 0.0

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