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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |
Schedule of Comprehensive Income [Table Text Block] | The components of Other Comprehensive Income Tax Benefit (Expense) for the nine and three months ended September 30, 2017 and 2016 were:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2017 |  | Sep 30, 2016 |  | Sep 30, 2017 |  | Sep 30, 2016
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |  |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment |  | $ | (39.1 | ) |  | $ | (76.0 | ) |  | $ | (7.0 | ) |  | $ | 2.0 |
Reclassification Adjustment for Amounts Included in Net Income |  | 9.7 |  |  | (0.4 | ) |  | 1.3 |  |  | 1.1 |
Unrealized Holding Gains |  | (29.4 | ) |  | (76.4 | ) |  | (5.7 | ) |  | 3.1 |
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment |  | (0.4 | ) |  | — |  |  | (0.1 | ) |  | — |
Reclassification Adjustment for Amounts Included in Net Income |  | — |  |  | — |  |  | — |  |  | — |
Foreign Currency Translation Adjustments |  | (0.4 | ) |  | — |  |  | (0.1 | ) |  | — |
Net Unrecognized Postretirement Benefit Costs Arising During the Period |  | — |  |  | 6.9 |  |  | — |  |  | — |
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |
Curtailment Loss Recognized |  | — |  |  | (0.4 | ) |  | — |  |  | — |
Amortization of Net Unrecognized Postretirement Benefit Costs |  | 0.2 |  |  | (1.7 | ) |  | 0.1 |  |  | (0.2 | )
Total Reclassification Adjustments for Amounts Included in Net Income |  | 0.2 |  |  | (2.1 | ) |  | 0.1 |  |  | (0.2 | )
Net Unrecognized Postretirement Benefit Costs |  | 0.2 |  |  | 4.8 |  |  | 0.1 |  |  | (0.2 | )
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment |  | 2.7 |  |  | — |  |  | — |  |  | — |
Reclassification Adjustment for Amounts Included in Net Income |  | (0.4 | ) |  | — |  |  | — |  |  | — |
Loss on Cash Flow Hedges |  | 2.3 |  |  | — |  |  | — |  |  | — |
Other Comprehensive Income Tax Benefit (Expense) |  | $ | (27.3 | ) |  | $ | (71.6 | ) |  | $ | (5.7 | ) |  | $ | 2.9 |
The components of Other Comprehensive Income (Loss) Before Income Taxes for the nine and three months ended September 30, 2017 and 2016 were:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2017 |  | Sep 30, 2016 |  | Sep 30, 2017 |  | Sep 30, 2016
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |
Unrealized Holding Gains Arising During the Period Before Reclassification Adjustment |  | $ | 110.5 |  |  | $ | 215.9 |  |  | $ | 19.2 |  |  | $ | (5.4 | )
Reclassification Adjustment for Amounts Included in Net Income |  | (27.7 | ) |  | 1.3 |  |  | (3.6 | ) |  | (2.9 | )
Unrealized Holding Gains |  | 82.8 |  |  | 217.2 |  |  | 15.6 |  |  | (8.3 | )
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment |  | 0.9 |  |  | — |  |  | 0.1 |  |  | — |
Reclassification Adjustment for Amounts Included in Net Income |  | — |  |  | — |  |  | — |  |  | — |
Foreign Currency Translation Adjustments |  | 0.9 |  |  | — |  |  | 0.1 |  |  | — |
Net Unrecognized Postretirement Benefit Costs Arising During the Period |  | — |  |  | (19.5 | ) |  | — |  |  | — |
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |
Curtailment Cost Recognized |  | — |  |  | 1.0 |  |  | — |  |  | — |
Amortization of Net Unrecognized Postretirement Benefit Costs |  | (0.4 | ) |  | 4.7 |  |  | (0.1 | ) |  | 0.4 |
Total Reclassification Adjustments for Amounts Included in Net Income |  | (0.4 | ) |  | 5.7 |  |  | (0.1 | ) |  | 0.4 |
Net Unrecognized Postretirement Benefit Costs |  | (0.4 | ) |  | (13.8 | ) |  | (0.1 | ) |  | 0.4 |
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment |  | (7.9 | ) |  | — |  |  | (0.3 | ) |  | — |
Reclassification Adjustment for Amounts Included in Net Income |  | 1.3 |  |  | — |  |  | 0.2 |  |  | — |
Loss on Cash Flow Hedges |  | (6.6 | ) |  | — |  |  | (0.1 | ) |  | — |
Other Comprehensive Income (Loss) Before Income Taxes |  | $ | 76.7 |  |  | $ | 203.4 |  |  | $ | 15.5 |  |  | $ | (7.9 | )
Schedule of Accumulated Other Comprehensive Income [Table Text Block] | The components of AOCI at September 30, 2017 and December 31, 2016 were:
(Dollars in Millions) |  | Sep 30, 2017 |  | Dec 31, 2016
Net Unrealized Gains on Investments, Net of Income Taxes: |  |  |  |
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings |  | $ | (0.1 | ) |  | $ | 0.1 |
Other Net Unrealized Gains on Investments |  | 265.3 |  |  | 211.7 |
Foreign Currency Translation Adjustments, Net of Income Taxes |  | (0.4 | ) |  | (0.9 | )
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes |  | (75.1 | ) |  | (74.9 | )
Gain (Loss) on Cash Flow Hedges, Net of Income Taxes |  | (3.3 | ) |  | 1.0 |
Accumulated Other Comprehensive Income |  | $ | 186.4 |  |  | $ | 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 nine and three months ended September 30, 2017 and 2016:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2017 |  | Sep 30, 2016 |  | Sep 30, 2017 |  | Sep 30, 2016
Reclassification of AOCI from Net Unrealized Gains on Investments to: |  |  |  |  |  |  |  |
Net Realized Gains on Sales of Investments |  | $ | 38.2 |  |  | $ | 22.7 |  |  | $ | 6.5 |  |  | $ | 11.2 |
Net Impairment Losses Recognized in Earnings |  | (10.5 | ) |  | (24.0 | ) |  | (2.9 | ) |  | (8.3 | )
Total Before Income Taxes |  | 27.7 |  |  | (1.3 | ) |  | 3.6 |  |  | 2.9 |
Income Tax Benefit (Expense) |  | (9.7 | ) |  | 0.4 |  |  | (1.3 | ) |  | (1.1 | )
Reclassification from AOCI, Net of Income Taxes |  | 18.0 |  |  | (0.9 | ) |  | 2.3 |  |  | 1.8 |
Reclassification of AOCI from Unrecognized Postretirement Benefit Costs to: |  |  |  |  |  |  |  |
Interest and Other Expenses |  | 0.4 |  |  | (5.7 | ) |  | 0.1 |  |  | (0.4 | )
Income Tax Benefit (Expense) |  | (0.2 | ) |  | 2.1 |  |  | (0.1 | ) |  | 0.2 |
Reclassification from AOCI, Net of Income Taxes |  | 0.2 |  |  | (3.6 | ) |  | — |  |  | (0.2 | )
Reclassification of AOCI from Loss on Cash Flow Hedges to: |  |  |  |  |  |  |  |
Interest and Other Expenses |  | (1.3 | ) |  | — |  |  | (0.2 | ) |  | — |
Income Tax Benefit |  | 0.4 |  |  | — |  |  | — |  |  | — |
Reclassification from AOCI, Net of Income Taxes |  | (0.9 | ) |  | — |  |  | (0.2 | ) |  | — |
Total Reclassification from AOCI to Net Income (Loss) |  | $ | 17.3 |  |  | $ | (4.5 | ) |  | $ | 2.1 |  |  | $ | 1.6 |

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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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