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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ (214.2) | $ 119.1 | $ (2.4)
Reclassification Adjustment for Amounts Included in Net Income | (21.9) | (35.3) | 0.2
Unrealized Holding Gains (Losses) | (236.1) | 83.8 | (2.2)
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 0.0 | 1.7 | (0.3)
Reclassification Adjustment for Amounts Included in Net Income | 0.3 | 0.0 | 0.0
Foreign Currency Translation Adjustments | 0.3 | 1.7 | (0.3)
Unrecognized Postretirement Benefit Costs Arising During the Year | (8.0) | 3.9 | 14.2
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax | 0.0 | 0.0 | 1.0
Amortization of Net Unrecognized Postretirement Benefit Costs | 1.1 | (0.6) | 5.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 1.1 | (0.6) | 6.3
Net Unrecognized Postretirement Benefit Costs | (6.9) | 3.3 | 20.5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 0.9 | (8.0) | 1.6
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0.3 | 1.3 | 0.0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | 1.2 | (6.7) | 1.6
Other Comprehensive Income (Loss) Before Income Taxes | (241.5) | 82.1 | 19.6
Income Tax Benefit (Expense): |  |  |
Unrealized Holding Gains and Losses Arising During the Year Before Reclassification Adjustment | 45.0 | (38.2) | 1.0
Reclassification Adjustment for Amounts Included in Net Income | 4.6 | 12.3 | (0.1)
Unrealized Holding Gains and Losses | 49.6 | (25.9) | 0.9
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 0.0 | (0.6) | 0.1
Reclassification Adjustment for Amounts Included in Net Income | (0.1) | 0.0 | 0.0
Foreign Currency Translation Adjustment | (0.1) | (0.6) | 0.1
Unrecognized Postretirement Benefit Costs Arising During the Year | 1.7 | (0.8) | (5.0)
Curtailment Cost Recognized | 0.0 | 0.0 | (0.4)
Amortization of Unrecognized Postretirement Benefit Costs | (0.2) | 0.2 | (1.9)
Total Reclassification Adjustments for Amounts Included in Net Income | (0.2) | 0.2 | (2.3)
Net Unrecognized Postretirement Benefit Costs | 1.5 | (0.6) | (7.3)
Gains and Losses on Cash Flow Hedges During the Year Before Reclassification Adjustment | (0.2) | 2.8 | (0.6)
Reclassification Adjustment for Amounts Included in Net Income | (0.1) | (0.4) | 0.0
Gains and Losses on Cash Flow Hedges | (0.3) | 2.4 | (0.6)
Other Comprehensive Income Tax Benefit (Expense) | $ 50.7 | $ (24.7) | $ (6.9)

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