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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2018
Statement of Comprehensive Income [Abstract] |
Schedule of Comprehensive Income [Table Text Block] | The components of Other Comprehensive Income (Loss) Before Income Taxes for the nine and three months ended September 30, 2018 and 2017 were:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2018 |  | Sep 30, 2017 |  | Sep 30, 2018 |  | Sep 30, 2017
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  | $ | (224.4 | ) |  | $ | 110.5 |  |  | $ | (43.4 | ) |  | $ | 19.2 |
Reclassification Adjustment for Amounts Included in Net Income |  | (7.7 | ) |  | (27.7 | ) |  | (6.5 | ) |  | (3.6 | )
Unrealized Holding Gains (Losses) |  | (232.1 | ) |  | 82.8 |  |  | (49.9 | ) |  | 15.6 |
Foreign Currency Translation Adjustments |  | 0.3 |  |  | 0.9 |  |  | — |  |  | 0.1 |
Net Unrecognized Postretirement Benefit Costs |  | 0.8 |  |  | (0.4 | ) |  | 0.2 |  |  | (0.1 | )
Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment |  | 0.8 |  |  | (7.9 | ) |  | 0.9 |  |  | (0.3 | )
Reclassification Adjustment for Amounts Included in Net Income |  | 0.3 |  |  | 1.3 |  |  | — |  |  | 0.2 |
Gain (Loss) on Cash Flow Hedges |  | 1.1 |  |  | (6.6 | ) |  | 0.9 |  |  | (0.1 | )
Other Comprehensive Income (Loss) Before Income Taxes |  | $ | (229.9 | ) |  | $ | 76.7 |  |  | $ | (48.8 | ) |  | $ | 15.5 |
The components of Other Comprehensive Income Tax Benefit (Expense) for the nine and three months ended September 30, 2018 and 2017 were:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2018 |  | Sep 30, 2017 |  | Sep 30, 2018 |  | Sep 30, 2017
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |  |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment |  | $ | 47.2 |  |  | $ | (39.1 | ) |  | $ | 9.2 |  |  | $ | (7.0 | )
Reclassification Adjustment for Amounts Included in Net Income |  | 1.6 |  |  | 9.7 |  |  | 1.3 |  |  | 1.3 |
Unrealized Holding Gains |  | 48.8 |  |  | (29.4 | ) |  | 10.5 |  |  | (5.7 | )
Foreign Currency Translation Adjustments |  | (0.1 | ) |  | (0.4 | ) |  | — |  |  | (0.1 | )
Net Unrecognized Postretirement Benefit Costs |  | (0.1 | ) |  | 0.2 |  |  | — |  |  | 0.1 |
Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment |  | (0.2 | ) |  | 2.7 |  |  | (0.2 | ) |  | — |
Reclassification Adjustment for Amounts Included in Net Income |  | (0.1 | ) |  | (0.4 | ) |  | (0.1 | ) |  | — |
Gain and Loss on Cash Flow Hedges |  | (0.3 | ) |  | 2.3 |  |  | (0.3 | ) |  | — |
Other Comprehensive Income Tax Benefit (Expense) |  | $ | 48.3 |  |  | $ | (27.3 | ) |  | $ | 10.2 |  |  | $ | (5.7 | )
Schedule of Accumulated Other Comprehensive Income [Table Text Block] | The components of AOCI at September 30, 2018 and December 31, 2017 were:
(Dollars in Millions) |  | Sep 30, 2018 |  | Dec 31, 2017
Net Unrealized Gains on Investments, Net of Income Taxes: |  |  |  |
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings |  | $ | — |  |  | $ | 0.2 |
Other Net Unrealized Gains on Investments |  | 122.6 |  |  | 269.5 |
Foreign Currency Translation Adjustments, Net of Income Taxes |  | — |  |  | 0.2 |
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes |  | (88.5 | ) |  | (72.2 | )
Loss on Cash Flow Hedges, Net of Income Taxes |  | (3.2 | ) |  | (3.3 | )
Accumulated Other Comprehensive Income |  | $ | 30.9 |  |  | $ | 194.4 |
Reclassification out of Accumulated Comprehensive Income [Table Text Block] | The components of AOCI at September 30, 2018 and December 31, 2017 were:
(Dollars in Millions) |  | Sep 30, 2018 |  | Dec 31, 2017
Net Unrealized Gains on Investments, Net of Income Taxes: |  |  |  |
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings |  | $ | — |  |  | $ | 0.2 |
Other Net Unrealized Gains on Investments |  | 122.6 |  |  | 269.5 |
Foreign Currency Translation Adjustments, Net of Income Taxes |  | — |  |  | 0.2 |
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes |  | (88.5 | ) |  | (72.2 | )
Loss on Cash Flow Hedges, Net of Income Taxes |  | (3.2 | ) |  | (3.3 | )
Accumulated Other Comprehensive Income |  | $ | 30.9 |  |  | $ | 194.4 |
Note 7 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (continued) Components of AOCI were reclassified to the following lines of the Condensed Consolidated Sta

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
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