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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |
Schedule of Comprehensive Income [Table Text Block] | The components of Other Comprehensive Income Before Income Taxes for the three months ended March 31, 2017 and 2016 were:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2017 |  | Mar 31, 2016
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  | $ | 33.6 |  |  | $ | 98.2 |
Reclassification Adjustment for Amounts Included in Net Income |  | (5.1 | ) |  | 2.5 |
Unrealized Holding Gains |  | 28.5 |  |  | 100.7 |
Foreign Currency Translation Adjustments |  | 0.1 |  |  | 0.1 |
Net Unrecognized Postretirement Benefit Costs Arising During the Period |  | — |  |  | (0.8 | )
Amortization of Net Unrecognized Postretirement Benefit Costs |  | (0.1 | ) |  | 2.6 |
Net Unrecognized Postretirement Benefit Costs |  | (0.1 | ) |  | 1.8 |
Loss on Cash Flow Hedge |  | (2.0 | ) |  | — |
Other Comprehensive Income Before Income Taxes |  | $ | 26.5 |  |  | $ | 102.6 |
The components of Other Comprehensive Income Tax Benefit (Expense) for the three months ended March 31, 2017 and 2016 were:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2017 |  | Mar 31, 2016
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment |  | $ | (11.9 | ) |  | $ | (34.6 | )
Reclassification Adjustment for Amounts Included in Net Income |  | 1.8 |  |  | (0.9 | )
Unrealized Holding Gains |  | (10.1 | ) |  | (35.5 | )
Foreign Currency Translation Adjustments |  | — |  |  | — |
Net Unrecognized Postretirement Benefit Costs Arising During the Period |  | — |  |  | 0.3 |
Amortization of Net Unrecognized Postretirement Benefit Costs |  | — |  |  | (1.0 | )
Net Unrecognized Postretirement Benefit Costs |  | — |  |  | (0.7 | )
Loss on Cash Flow Hedge |  | 0.7 |  |  | — |
Other Comprehensive Income Tax Expense |  | $ | (9.4 | ) |  | $ | (36.2 | )
Schedule of Accumulated Other Comprehensive Income [Table Text Block] | The components of AOCI at March 31, 2017 and December 31, 2016 were:
(Dollars in Millions) |  | Mar 31, 2017 |  | Dec 31, 2016
Net Unrealized Gains (Losses) on Investments, Net of Income Taxes: |  |  |  |
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings |  | $ | — |  |  | $ | 0.1 |
Other Net Unrealized Gains on Investments |  | 230.2 |  |  | 211.7 |
Foreign Currency Translation Adjustments, Net of Income Taxes |  | (0.8 | ) |  | (0.9 | )
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes |  | (75.0 | ) |  | (74.9 | )
Gain (Loss) on Cash Flow Hedge, Net of Income Taxes |  | (0.3 | ) |  | 1.0 |
Accumulated Other Comprehensive Income |  | $ | 154.1 |  |  | $ | 137.0 |
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, 2017 and 2016:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2017 |  | Mar 31, 2016
Reclassification of AOCI from Net Unrealized Gains on Investments to: |  |  |  |
Net Realized Gains on Sales of Investments |  | $ | 10.1 |  |  | $ | 6.8 |
Net Impairment Losses Recognized in Earnings |  | (5.0 | ) |  | (9.3 | )
Total Before Income Taxes |  | 5.1 |  |  | (2.5 | )
Income Tax Benefit (Expense) |  | (1.8 | ) |  | 0.9 |
Reclassification from AOCI, Net of Income Taxes |  | 3.3 |  |  | (1.6 | )
Reclassification of AOCI from Unrecognized Postretirement Benefit Costs to: |  |  |  |
Interest and Other Expenses |  | 0.1 |  |  | (2.6 | )
Income Tax Benefit |  | — |  |  | 1.0 |
Reclassification from AOCI, Net of Income Taxes |  | 0.1 |  |  | (1.6 | )
Total Reclassification from AOCI to Net Income |  | $ | 3.4 |  |  | $ | (3.2 | )

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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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