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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Realized Gains (Losses) on Sales of Investments |  |  |  |  |  |  |  |  | $ 26.4 | $ 56.5 | $ 33.1
Net Impairment Losses Recognized in Earnings | $ (2.2) | $ (1.8) | $ 0.0 | $ (0.5) | $ (3.8) | $ (2.9) | $ (2.6) | $ (5.0) | (4.5) | (14.3) | (32.7)
Interest and Other Expenses | (42.6) | (61.7) | (25.7) | (29.0) | (21.5) | (18.2) | (21.4) | (19.5) | (159.0) | (80.6) | (90.3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  |  |  |  |  |  |  | 0.3 | 1.3 | 0.0
Income Tax Benefit (Expense) | (1.1) | 11.8 | (8.0) | (13.4) | (8.3) | (20.5) | (15.5) | 3.1 | (10.7) | (41.2) | 9.2
Net Income | $ 6.5 | $ 92.2 | $ 37.6 | $ 53.8 | $ 36.9 | $ 47.7 | $ 36.6 | $ (0.3) | 190.1 | 120.9 | 16.8
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 16.2 | 22.5 | (4.1)
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 |  |  |  |  |  |  |  |  | 26.4 | 49.6 | 32.0
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | (4.5) | (14.3) | (32.2)
Total Before Income Taxes |  |  |  |  |  |  |  |  | 21.9 | 35.3 | (0.2)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (4.6) | (12.3) | 0.1
Net Income |  |  |  |  |  |  |  |  | 17.3 | 23.0 | (0.1)
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 |  |  |  |  |  |  |  |  | (1.1) | 0.6 | (6.3)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 0.2 | (0.2) | 2.3
Net Income |  |  |  |  |  |  |  |  | (0.9) | 0.4 | (4.0)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and Other Expenses |  |  |  |  |  |  |  |  | (0.3) | (1.3) | 0.0
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 0.1 | 0.4 | 0.0
Net Income |  |  |  |  |  |  |  |  | $ (0.2) | $ (0.9) | $ 0.0

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