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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Realized Gains on Sales of Investments | $ 3.6 | $ 8.1 | $ 10.0 | $ 45.0
Net Impairment Losses Recognized in Earnings | (1.8) | (2.9) | (2.3) | (10.5)
Interest and Other Expenses | (61.7) | (18.2) | (116.4) | (59.1)
Total Before Income Taxes | 80.5 | 68.3 | 193.0 | 116.9
Income Tax Expense | 11.8 | (20.5) | (9.6) | (32.9)
Net Income | 92.2 | 47.7 | 183.6 | 84.0
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Income | 4.9 | 2.1 | 5.2 | 17.3
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 | 8.3 | 6.5 | 10.0 | 38.2
Net Impairment Losses Recognized in Earnings | (1.8) | (2.9) | (2.3) | (10.5)
Total Before Income Taxes | 6.5 | 3.6 | 7.7 | 27.7
Income Tax Expense | (1.3) | (1.3) | (1.6) | (9.7)
Net Income | 5.2 | 2.3 | 6.1 | 18.0
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 | (0.2) | 0.1 | (0.8) | 0.4
Income Tax Expense | 0.0 | (0.1) | 0.1 | (0.2)
Net Income | (0.2) | 0.0 | (0.7) | 0.2
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) | (0.2) | (0.3) | (1.3)
Income Tax Expense | 0.1 | 0.0 | 0.1 | 0.4
Net Income | $ (0.1) | $ (0.2) | $ (0.2) | $ (0.9)

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