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Investments (Tables) | 6 Months Ended
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Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at June 30, 2013 by contractual maturity were:
(Dollars in Millions) |  | Amortized Cost |  | Fair Value
Due in One Year or Less |  | $ | 115.0 |  |  | $ | 117.8 |
Due after One Year to Five Years |  | 641.9 |  |  | 675.9 |
Due after Five Years to Ten Years |  | 1,259.5 |  |  | 1,295.9 |
Due after Ten Years |  | 2,182.3 |  |  | 2,383.4 |
Asset-backed Securities Not Due at a Single Maturity Date |  | 217.6 |  |  | 228.1 |
Investments in Fixed Maturities |  | $ | 4,416.3 |  |  | $ | 4,701.1 |
Schedule of Unrealized Loss on Investments [Table Text Block] | An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at December 31, 2012 is presented below:
|  | Less Than 12 Months |  | 12 Months or Longer |  | Total
(Dollars in Millions) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 40.8 |  |  | $ | (0.2 | ) |  | $ | — |  |  | $ | — |  |  | $ | 40.8 |  |  | $ | (0.2 | )
States and Political Subdivisions |  | 6.3 |  |  | (0.1 | ) |  | 0.3 |  |  | — |  |  | 6.6 |  |  | (0.1 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 268.5 |  |  | (5.2 | ) |  | 38.1 |  |  | (2.3 | ) |  | 306.6 |  |  | (7.5 | )
Redeemable Preferred Stocks |  | — |  |  | — |  |  | 0.4 |  |  | — |  |  | 0.4 |  |  | — |
Mortgage and Asset-backed |  | — |  |  | — |  |  | 1.7 |  |  | (0.3 | ) |  | 1.7 |  |  | (0.3 | )
Total Fixed Maturities |  | 315.6 |  |  | (5.5 | ) |  | 40.5 |  |  | (2.6 | ) |  | 356.1 |  |  | (8.1 | )
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | — |  |  | 2.4 |  |  | (0.1 | ) |  | 2.4 |  |  | (0.1 | )
Other Industries |  | 2.3 |  |  | (0.8 | ) |  | 3.7 |  |  | (0.1 | ) |  | 6.0 |  |  | (0.9 | )
Common Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing |  | 6.3 |  |  | (0.4 | ) |  | — |  |  | — |  |  | 6.3 |  |  | (0.4 | )
Other Industries |  | 14.2 |  |  | (0.4 | ) |  | 1.3 |  |  | (0.1 | ) |  | 15.5 |  |  | (0.5 | )
Other Equity Interests: |  |  |  |  |  |  |  |  |  |  |  |
Limited Liability Companies and Limited Partnerships |  | 5.5 |  |  | (0.5 | ) |  | 6.7 |  |  | (0.9 | ) |  | 12.2 |  |  | (1.4 | )
Total Equity Securities |  | 28.3 |  |  | (2.1 | ) |  | 14.1 |  |  | (1.2 | ) |  | 42.4 |  |  | (3.3 | )
Total |  | $ | 343.9 |  |  | $ | (7.6 | ) |  | $ | 54.6 |  |  | $ | (3.8 | ) |  | $ | 398.5 |  |  | $ | (11.4 | )
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at June 30, 2013 is presented below:
|  | Less Than 12 Months |  | 12 Months or Longer |  | Total
(Dollars in Millions) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 89.5 |  |  | $ | (7.1 | ) |  | $ | 0.1 |  |  | $ | — |  |  | $ | 89.6 |  |  | $ | (7.1 | )
States and Political Subdivisions |  | 216.8 |  |  | (16.1 | ) |  | 0.3 |  |  | — |  |  | 217.1 |  |  | (16.1 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 754.4 |  |  | (38.6 | ) |  | 59.6 |  |  | (3.8 | ) |  | 814.0 |  |  | (42.4 | )
Mortgage and Asset-backed |  | 23.3 |  |  | (0.9 | ) |  | 1.6 |  |  | (0.1 | ) |  | 24.9 |  |  | (1.0 | )
Total Fixed Maturities |  | 1,084.0 |  |  | (62.7 | ) |  | 61.6 |  |  | (3.9 | ) |  | 1,145.6 |  |  | (66.6 | )
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 14.2 |  |  | (0.8 | ) |  | 2.4 |  |  | (0.1 | ) |  | 16.6 |  |  | (0.9 | )
Other Industries |  | 1.4 |  |  | (0.5 | ) |  | 0.7 |  |  | — |  |  | 2.1 |  |  | (0.5 | )
Common Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing |  | 2.5 |  |  | (0.2 | ) |  | 0.2 |  |  | — |  |  | 2.7 |  |  | (0.2 | )
Other Industries |  | 2.2 |  |  | (0.4 | ) |  | 0.5 |  |  | — |  |  | 2.7 |  |  | (0.4 | )
Other Equity Interests: |  |  |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 82.2 |  |  | (1.5 | ) |  | — |  |  | — |  |  | 82.2 |  |  | (1.5 | )
Limited Liability Companies and Limited Partnerships |  | 61.9 |  |  | (1.9 | ) |  | 6.0 |  |  | (0.7 | ) |  | 67.9 |  |  | (2.6 | )
Total Equity Securities |  | 164.4 |  |  | (5.3 | ) |  | 9.8 |  |  | (0.8 | ) |  | 174.2 |  |  | (6.1 | )
Total |  | $ | 1,248.4 |  |  | $ | (68.0 | ) |  | $ | 71.4 |  |  | $ | (4.7 | ) |  | $ | 1,319.8 |  |  | $ | (72.7 | )
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] | The following table sets forth the pre-tax amount of other-than-temporary-impairment (“OTTI”) credit losses, recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of the dates indicated, for which a portion of the OTTI loss has been recognized in Accumulated Other Comprehensive Income, and the corresponding changes in such amounts.
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2013 |  | Jun 30, 2012 |  | Jun 30, 2013 |  | Jun 30, 2012
Balance at Beginning of Period |  | $ | 4.6 |  |  | $ | 3.9 |  |  | $ | 4.1 |  |  | $ | 3.8 |
Additions for Previously Unrecognized OTTI Credit Losses |  | 1.0 |  |  | — |  |  | 0.3 |  |  | — |
Reductions to Previously Recognized OTTI Credit Losses |  | — |  |  | (0.1 | ) |  | — |  |  | — |
Reductions for Change in Impairment Status: |  |  |  |  |  |  |  |
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell |  | (1.1 | ) |  | — |  |  | — |  |  | — |
Reductions for Investments Sold During Period |  | (0.1 | ) |  | (0.2 | ) |  | — |  |  | (0.2 | )
Balance at End of Period |  | $ | 4.4 |  |  | $ | 3.6 |  |  | $ | 4.4 |  |  | $ | 3.6 |
Schedule of Other Investments [Table Text Block] | The carrying values of the Company’s Other Investments at June 30, 2013 and December 31, 2012 were:
(Dollars in Millions) |  | Jun 30, 2013 |  | Dec 31, 2012
Loans to Policyholders at Unpaid Principal |  | $ | 270.0 |  |  | $ | 266.3 |
Real Estate at Depreciated Cost |  | 221.0 |  |  | 226.2 |
Trading Securities at Fair Value |  | 4.5 |  |  | 4.5 |
Other |  | 0.5 |  |  | 0.5 |
Total |  | $ | 496.0 |  |  | $ | 497.5 |
Fixed Maturities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2012 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
(Dollars in Millions) |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 384.0 |  |  | $ | 45.1 |  |  | $ | (0.2 | ) |  | $ | 428.9 |
States and Political Subdivisions |  | 1,251.0 |  |  | 150.5 |  |  | (0.1 | ) |  | 1,401.4 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 2,615.5 |  |  | 385.4 |  |  | (7.5 | ) |  | 2,993.4 |
Redeemable Preferred Stocks |  | 30.1 |  |  | 2.5 |  |  | — |  |  | 32.6 |
Mortgage and Asset-backed |  | 3.2 |  |  | 1.0 |  |  | (0.3 | ) |  | 3.9 |
Investments in Fixed Maturities |  | $ | 4,283.8 |  |  | $ | 584.5 |  |  | $ | (8.1 | ) |  | $ | 4,860.2 |
The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at June 30, 2013 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
(Dollars in Millions) |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 372.5 |  |  | $ | 29.8 |  |  | $ | (7.1 | ) |  | $ | 395.2 |
States and Political Subdivisions |  | 1,333.7 |  |  | 83.6 |  |  | (16.1 | ) |  | 1,401.2 |
Canadian Government and Provinces |  | 0.6 |  |  | — |  |  | — |  |  | 0.6 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 2,669.9 |  |  | 234.3 |  |  | (42.4 | ) |  | 2,861.8 |
Redeemable Preferred Stocks |  | 2.1 |  |  | 2.2 |  |  | — |  |  | 4.3 |
Mortgage and Asset-backed |  | 37.5 |  |  | 1.5 |  |  | (1.0 | ) |  | 38.0 |
Investments in Fixed Maturities |  | $ | 4,416.3 |  |  | $ | 351.4 |  |  | $ | (66.6 | ) |  | $ | 4,701.1 |
Equity Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at June 30, 2013 were:
|  |  |  | Gross Unrealized |  |
(Dollars in Millions) |  | Cost |  | Gains |  | Losses |  | Fair Value
Preferred Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | $ | 75.4 |  |  | $ | 3.3 |  |  | $ | (0.9 | ) |  | $ | 77.8 |
Other Industries |  | 14.5 |  |  | 5.3 |  |  | (0.5 | ) |  | 19.3 |
Common Stocks: |  |  |  |  |  |  |  |
Manufacturing |  | 67.3 |  |  | 27.9 |  |  | (0.2 | ) |  | 95.0 |
Other Industries |  | 49.8 |  |  | 17.2 |  |  | (0.4 | ) |  | 66.6 |
Other Equity Interests: |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 140.2 |  |  | 0.3 |  |  | (1.5 | ) |  | 139.0 |
Limited Liability Companies and Limited Partnerships |  | 130.0 |  |  | 19.9 |  |  | (2.6 | ) |  | 147.3 |
Investments in Equity Securities |  | $ | 477.2 |  |  | $ | 73.9 |  |  | $ | (6.1 | ) |  | $ | 545.0 |
Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at December 31, 2012 were:
|  |  |  | Gross Unrealized |  |
(Dollars in Millions) |  | Cost |  | Gains |  | Losses |  | Fair Value
Preferred Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | $ | 75.4 |  |  | $ | 3.9 |  |  | $ | (0.1 | ) |  | $ | 79.2 |
Other Industries |  | 18.4 |  |  | 3.8 |  |  | (0.9 | ) |  | 21.3 |
Common Stocks: |  |  |  |  |  |  |  |
Manufacturing |  | 67.0 |  |  | 20.9 |  |  | (0.4 | ) |  | 87.5 |
Other Industries |  | 59.1 |  |  | 8.1 |  |  | (0.5 | ) |  | 66.7 |
Other Equity Interests: |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 119.6 |  |  | 6.3 |  |  | — |  |  | 125.9 |
Limited Liability Companies and Limited Partnerships |  | 123.2 |  |  | 19.5 |  |  | (1.4 | ) |  | 141.3 |
Investments in Equity Securities |  | $ | 462.7 |  |  | $ | 62.5 |  |  | $ | (3.3 | ) |  | $ | 521.9 |

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