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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
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Mar. 31, 2019 | Mar. 31, 2018
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Net Realized Gains on Sales of Investments | $ 16.1 | $ 2.6
Net Impairment Losses Recognized in Earnings | (3.6) | (0.5)
Interest and Other Expenses | (41.4) | (29.0)
Total Before Income Taxes | 194.7 | 67.0
Income Tax Expense | (39.4) | (13.4)
Net Income | 155.3 | 53.8
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Net Income | 10.4 | 1.3
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 | 16.1 | 2.4
Net Impairment Losses Recognized in Earnings | (3.6) | (0.5)
Total Before Income Taxes | 12.5 | 1.9
Income Tax Expense | (2.6) | (0.4)
Net Income | 9.9 | 1.5
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 | 0.6 | (0.3)
Income Tax Expense | (0.2) | 0.1
Net Income | 0.4 | (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 | 0.1 | (0.1)
Income Tax Expense | 0.0 | 0.1
Net Income | $ 0.1 | $ 0.0

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