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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Other Comprehensive Income (Loss) Before Income Taxes: |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ 175.3 | $ (119.5)
Reclassification Adjustment for Amounts Included in Net Income | (12.5) | (1.9)
Unrealized Holding Gains (Losses) | 162.8 | (121.4)
Foreign Currency Translation Adjustments | 0.0 | (0.9)
Net Unrecognized Postretirement Benefit Costs | 0.6 | 0.3
Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment | 0.0 | 0.6
Reclassification Adjustment for Amounts Included in Net Income | 0.1 | 0.3
Gain (Loss) on Cash Flow Hedges | 0.1 | 0.9
Other Comprehensive Income (Loss) Before Income Taxes | 163.5 | (121.1)
Other Comprehensive Income Tax Benefit (Expense): |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment | (36.8) | 25.0
Reclassification Adjustment for Amounts Included in Net Income | 2.6 | 0.4
Unrealized Holding Gains | (34.2) | 25.4
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax | 0.0 | (0.2)
Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment | 0.0 | (0.1)
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | (0.1)
Gain and Loss on Cash Flow Hedges | 0.0 | (0.2)
Other Comprehensive Income Tax Benefit (Expense) | 34.4 | (25.4)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | $ 0.2 | $ 0.0

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