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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, 2018 | Mar. 31, 2017
Other Comprehensive Income (Loss) Before Income Taxes: |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ (119.5) | $ 33.6
Reclassification Adjustment for Amounts Included in Net Income | (1.9) | (5.1)
Unrealized Holding Gains (Losses) | (121.4) | 28.5
Foreign Currency Translation Adjustments | (0.9) | 0.1
Net Unrecognized Postretirement Benefit Costs | 0.3 | (0.1)
Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment | 0.6 | (2.0)
Reclassification Adjustment for Amounts Included in Net Income | 0.3 | 0.0
Gain (Loss) on Cash Flow Hedges | 0.9 | (2.0)
Other Comprehensive Income (Loss) Before Income Taxes | (121.1) | 26.5
Other Comprehensive Income Tax Benefit (Expense): |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment | 25.0 | (11.9)
Reclassification Adjustment for Amounts Included in Net Income | 0.4 | 1.8
Unrealized Holding Gains | 25.4 | (10.1)
Foreign Currency Translation Adjustments | 0.2 | 0.0
Net Unrecognized Postretirement Benefit Costs | 0.0 | 0.0
Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment | (0.1) | 0.7
Reclassification Adjustment for Amounts Included in Net Income | (0.1) | 0.0
Gain and Loss on Cash Flow Hedges | (0.2) | 0.7
Other Comprehensive Income Tax Benefit (Expense) | $ (25.4) | $ 9.4

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