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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2017
Statement of Comprehensive Income [Abstract] |
Schedule of Comprehensive Income [Table Text Block] | The components of Other Comprehensive Income Before Income Taxes for the six and three months ended June 30, 2017 and 2016 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2017 |  | Jun 30, 2016 |  | Jun 30, 2017 |  | Jun 30, 2016
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |
Unrealized Holding Gains Arising During the Period Before Reclassification Adjustment |  | $ | 91.3 |  |  | $ | 221.3 |  |  | $ | 57.7 |  |  | $ | 123.1 |
Reclassification Adjustment for Amounts Included in Net Income |  | (24.1 | ) |  | 4.2 |  |  | (19.0 | ) |  | 1.7 |
Unrealized Holding Gains |  | 67.2 |  |  | 225.5 |  |  | 38.7 |  |  | 124.8 |
Foreign Currency Translation Adjustments |  | 0.8 |  |  | — |  |  | 0.7 |  |  | (0.1 | )
Net Unrecognized Postretirement Benefit Costs Arising During the Period |  | — |  |  | (19.5 | ) |  | — |  |  | (18.7 | )
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |
Curtailment Cost Recognized |  | — |  |  | 1.0 |  |  | — |  |  | 1.0 |
Amortization of Net Unrecognized Postretirement Benefit Costs |  | (0.3 | ) |  | 4.3 |  |  | (0.2 | ) |  | 1.7 |
Total Reclassification Adjustments for Amounts Included in Net Income |  | (0.3 | ) |  | 5.3 |  |  | (0.2 | ) |  | 2.7 |
Net Unrecognized Postretirement Benefit Costs |  | (0.3 | ) |  | (14.2 | ) |  | (0.2 | ) |  | (16.0 | )
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment |  | (7.6 | ) |  | — |  |  | (5.6 | ) |  | — |
Reclassification Adjustment for Amounts Included in Net Income |  | 1.1 |  |  | — |  |  | 1.1 |  |  | — |
Loss on Cash Flow Hedges |  | (6.5 | ) |  | — |  |  | (4.5 | ) |  | — |
Other Comprehensive Income Before Income Taxes |  | $ | 61.2 |  |  | $ | 211.3 |  |  | $ | 34.7 |  |  | $ | 108.7 |
The components of Other Comprehensive Income Tax Benefit (Expense) for the six and three months ended June 30, 2017 and 2016 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2017 |  | Jun 30, 2016 |  | Jun 30, 2017 |  | Jun 30, 2016
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |  |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment |  | $ | (32.1 | ) |  | $ | (78.0 | ) |  | $ | (20.2 | ) |  | $ | (43.4 | )
Reclassification Adjustment for Amounts Included in Net Income |  | 8.4 |  |  | (1.5 | ) |  | 6.6 |  |  | (0.6 | )
Unrealized Holding Gains |  | (23.7 | ) |  | (79.5 | ) |  | (13.6 | ) |  | (44.0 | )
Foreign Currency Translation Adjustments |  | (0.3 | ) |  | — |  |  | (0.3 | ) |  | — |
Net Unrecognized Postretirement Benefit Costs Arising During the Period |  | — |  |  | 6.9 |  |  | — |  |  | 6.6 |
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |
Curtailment Loss Recognized |  | — |  |  | (0.4 | ) |  | — |  |  | (0.4 | )
Amortization of Net Unrecognized Postretirement Benefit Costs |  | 0.1 |  |  | (1.5 | ) |  | 0.1 |  |  | (0.5 | )
Total Reclassification Adjustments for Amounts Included in Net Income |  | 0.1 |  |  | (1.9 | ) |  | 0.1 |  |  | (0.9 | )
Net Unrecognized Postretirement Benefit Costs |  | 0.1 |  |  | 5.0 |  |  | 0.1 |  |  | 5.7 |
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment |  | 2.7 |  |  | — |  |  | 2.0 |  |  | — |
Reclassification Adjustment for Amounts Included in Net Income |  | (0.4 | ) |  | — |  |  | (0.4 | ) |  | — |
Loss on Cash Flow Hedges |  | 2.3 |  |  | — |  |  | 1.6 |  |  | — |
Other Comprehensive Income Tax Expense |  | $ | (21.6 | ) |  | $ | (74.5 | ) |  | $ | (12.2 | ) |  | $ | (38.3 | )
Schedule of Accumulated Other Comprehensive Income [Table Text Block] | The components of AOCI at June 30, 2017 and December 31, 2016 were:
(Dollars in Millions) |  | Jun 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 |  | 255.4 |  |  | 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 |  | (3.2 | ) |  | 1.0 |
Accumulated Other Comprehensive Income |  | $ | 176.6 |  |  | $ | 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 Income for the six and three months ended June 30, 2017 and 2016:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2017 |  | Jun 30, 2016 |  | Jun 30, 2017 |  | Jun 30, 2016
Reclassification of AOCI from Net Unrealized Gains on Investments to: |  |  |  |  |  |  |  |
Net Realized Gains on Sales of Investments |  | $ | 31.7 |  |  | $ | 11.5 |  |  | $ | 21.6 |  |  | $ | 4.7 |
Net Impairment Losses Recognized in Earnings |  | (7.6 | ) |  | (15.7 | ) |  | (2.6 | ) |  | (6.4 | )
Total Before Income Taxes |  | 24.1 |  |  | (4.2 | ) |  | 19.0 |  |  | (1.7 | )
Income Tax Benefit (Expense) |  | (8.4 | ) |  | 1.5 |  |  | (6.6 | ) |  | 0.6 |
Reclassification from AOCI, Net of Income Taxes |  | 15.7 |  |  | (2.7 | ) |  | 12.4 |  |  | (1.1 | )
Reclassification of AOCI from Unrecognized Postretirement Benefit Costs to: |  |  |  |  |  |  |  |
Interest and Other Expenses |  | 0.3 |  |  | (5.3 | ) |  | 0.2 |  |  | (2.7 | )
Income Tax Benefit (Expense) |  | (0.1 | ) |  | 1.9 |  |  | (0.1 | ) |  | 0.9 |
Reclassification from AOCI, Net of Income Taxes |  | 0.2 |  |  | (3.4 | ) |  | 0.1 |  |  | (1.8 | )
Reclassification of AOCI from Loss on Cash Flow Hedges to: |  |  |  |  |  |  |  |
Interest and Other Expenses |  | (1.1 | ) |  | — |  |  | (1.1 | ) |  | — |
Income Tax Benefit |  | 0.4 |  |  | — |  |  | 0.4 |  |  | — |
Reclassification from AOCI, Net of Income Taxes |  | (0.7 | ) |  | — |  |  | (0.7 | ) |  | — |
Total Reclassification from AOCI to Net Income |  | $ | 15.2 |  |  | $ | (6.1 | ) |  | $ | 11.8 |  |  | $ | (2.9 | )

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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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