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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |  |
Unrealized Holding Gains Arising During the Period Before Reclassification Adjustment | $ 19.2 | $ (5.4) | $ 110.5 | $ 215.9
Reclassification Adjustment for Amounts Included in Net Income | (3.6) | (2.9) | (27.7) | 1.3
Unrealized Holding Gains | 15.6 | (8.3) | 82.8 | 217.2
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 0.1 | 0.0 | 0.9 | 0.0
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | 0.0 | 0.0 | 0.0
Foreign Currency Translation Adjustments | 0.1 | 0.0 | 0.9 | 0.0
Net Unrecognized Postretirement Benefit Costs Arising During the Period | 0.0 | 0.0 | 0.0 | (19.5)
Curtailment Cost Recognized | 0.0 | 0.0 | 0.0 | 1.0
Amortization of Net Unrecognized Postretirement Benefit Costs | (0.1) | 0.4 | (0.4) | 4.7
Total Reclassification Adjustments for Amounts Included in Net Income | (0.1) | 0.4 | (0.4) | 5.7
Net Unrecognized Postretirement Benefit Costs | (0.1) | 0.4 | (0.4) | (13.8)
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment | (0.3) | 0.0 | (7.9) | 0.0
Reclassification Adjustment for Amounts Included in Net Income | 0.2 | 0.0 | 1.3 | 0.0
Loss on Cash Flow Hedges | (0.1) | 0.0 | (6.6) | 0.0
Other Comprehensive Income (Loss) Before Income Taxes | 15.5 | (7.9) | 76.7 | 203.4
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment | (7.0) | 2.0 | (39.1) | (76.0)
Reclassification Adjustment for Amounts Included in Net Income | 1.3 | 1.1 | 9.7 | (0.4)
Unrealized Holding Gains | (5.7) | 3.1 | (29.4) | (76.4)
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 0.1 | 0.0 | 0.4 | 0.0
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | 0.0 | 0.0 | 0.0
Foreign Currency Translation Adjustments | (0.1) | 0.0 | (0.4) | 0.0
Net Unrecognized Postretirement Benefit Costs Arising During the Period | 0.0 | 0.0 | 0.0 | 6.9
Curtailment Loss Recognized | 0.0 | 0.0 | 0.0 | (0.4)
Amortization of Net Unrecognized Postretirement Benefit Costs | 0.1 | (0.2) | 0.2 | (1.7)
Total Reclassification Adjustments for Amounts Included in Net Income | 0.1 | (0.2) | 0.2 | (2.1)
Net Unrecognized Postretirement Benefit Costs | 0.1 | (0.2) | 0.2 | 4.8
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment | 0.0 | 0.0 | 2.7 | 0.0
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | 0.0 | (0.4) | 0.0
Loss on Cash Flow Hedges | 0.0 | 0.0 | 2.3 | 0.0
Other Comprehensive Income Tax Benefit (Expense) | $ 5.7 | $ (2.9) | $ 27.3 | $ 71.6

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