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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 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 three months ended March 31, 2018 and 2017 were:
|  | Three Months Ended
(Dollars in Millions) |  | 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 |  |  | — |
Gain (Loss) on Cash Flow Hedges |  | 0.9 |  |  | (2.0 | )
Other Comprehensive Income (Loss) Before Income Taxes |  | $ | (121.1 | ) |  | $ | 26.5 |
The components of Other Comprehensive Income Tax Benefit (Expense) for the three months ended March 31, 2018 and 2017 were:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2018 |  | Mar 31, 2017
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 |  |  | — |
Net Unrecognized Postretirement Benefit Costs |  | — |  |  | — |
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 | ) |  | — |
Gain and Loss on Cash Flow Hedges |  | (0.2 | ) |  | 0.7 |
Other Comprehensive Income Tax Benefit (Expense) |  | $ | 25.4 |  |  | $ | (9.4 | )
Schedule of Accumulated Other Comprehensive Income [Table Text Block] | The components of AOCI at March 31, 2018 and December 31, 2017 were:
(Dollars in Millions) |  | Mar 31, 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 |  | 209.7 |  |  | 269.5 |
Foreign Currency Translation Adjustments, Net of Income Taxes |  | (0.5 | ) |  | 0.2 |
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes |  | (89.0 | ) |  | (72.2 | )
Loss on Cash Flow Hedges, Net of Income Taxes |  | (3.3 | ) |  | (3.3 | )
Accumulated Other Comprehensive Income |  | $ | 116.9 |  |  | $ | 194.4 |
Reclassification out of Accumulated Comprehensive Income [Table Text Block] | Components of AOCI were reclassified to the following lines of the Condensed Consolidated Statements of Operations for the three months ended March 31, 2018 and 2017:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2018 |  | Mar 31, 2017
Reclassification of AOCI from Net Unrealized Gains on Investments to: |  |  |  |
Net Realized Gains on Sales of Investments |  | $ | 2.4 |  |  | $ | 10.1 |
Net Impairment Losses Recognized in Earnings |  | (0.5 | ) |  | (5.0 | )
Total Before Income Taxes |  | 1.9 |  |  | 5.1 |
Income Tax Expense |  | (0.4 | ) |  | (1.8 | )
Reclassification from AOCI, Net of Income Taxes |  | 1.5 |  |  | 3.3 |
Reclassification of AOCI from Unrecognized Postretirement Benefit Costs to: |  |  |  |
Interest and Other Expenses |  | (0.3 | ) |  | 0.1 |
Income Tax Benefit |  | 0.1 |  |  | — |
Reclassification from AOCI, Net of Income Taxes |  | (0.2 | ) |  | 0.1 |
Reclassification of AOCI from Loss on Cash Flow Hedges to: |  |  |  |
Interest and Other Expenses |  | (0.1 | ) |  | — |
Income Tax Benefit |  | 0.1 |  |  | — |
Reclassification from AOCI, Net of Income Taxes |  | — |  |  | — |
Total Reclassification from AOCI to Net Income (Loss) |  | $ | 1.3 |  |  | $ | 3.4 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e526-108580 + Details
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