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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ 119.1 | $ (2.4) | $ (151.9)
Reclassification Adjustment for Amounts Included in Net Income | (35.3) | 0.2 | (25.4)
Unrealized Holding Gains (Losses) | 83.8 | (2.2) | (177.3)
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 1.7 | (0.3) | (1.4)
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | 0.0 | 0.0
Foreign Currency Translation Adjustments | 1.7 | (0.3) | (1.4)
Unrecognized Postretirement Benefit Costs Arising During the Year | 3.9 | 14.2 | 3.0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax | 0.0 | 1.0 | 0.0
Amortization of Net Unrecognized Postretirement Benefit Costs | (0.6) | 5.3 | 23.1
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax | (0.6) | 6.3 | 23.1
Net Unrecognized Postretirement Benefit Costs | 3.3 | 20.5 | 26.1
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (8.0) | 1.6 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 1.3 | 0.0 | 0.0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | (6.7) | 1.6 | 0.0
Other Comprehensive Income (Loss) Before Income Taxes | 82.1 | 19.6 | (152.6)
Income Tax Benefit (Expense): |  |  |
Unrealized Holding Gains and Losses Arising During the Year Before Reclassification Adjustment | (38.2) | 1.0 | 53.9
Reclassification Adjustment for Amounts Included in Net Income | 12.3 | (0.1) | 8.9
Unrealized Holding Gains and Losses | (25.9) | 0.9 | 62.8
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | (0.6) | 0.1 | 0.5
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | 0.0 | 0.0
Foreign Currency Translation Adjustment | (0.6) | 0.1 | 0.5
Unrecognized Postretirement Benefit Costs Arising During the Year | (0.8) | (5.0) | (1.1)
Curtailment Cost Recognized | 0.0 | (0.4) | 0.0
Amortization of Unrecognized Postretirement Benefit Costs | 0.2 | (1.9) | (8.0)
Total Reclassification Adjustments for Amounts Included in Net Income | 0.2 | (2.3) | (8.0)
Net Unrecognized Postretirement Benefit Costs | (0.6) | (7.3) | (9.1)
Gains and Losses on Cash Flow Hedges During the Year Before Reclassification Adjustment | 2.8 | (0.6) | 0.0
Reclassification Adjustment for Amounts Included in Net Income | (0.4) | 0.0 | 0.0
Gains and Losses on Cash Flow Hedges | 2.4 | (0.6) | 0.0
Other Comprehensive Income Tax Benefit (Expense) | $ (24.7) | $ (6.9) | $ 54.2

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