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Investments (Tables) | 9 Months Ended
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Sep. 30, 2014
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 September 30, 2014 by contractual maturity were:
(Dollars in Millions) |  | Amortized Cost |  | Fair Value
Due in One Year or Less |  | $ | 46.6 |  |  | $ | 47.9 |
Due after One Year to Five Years |  | 728.5 |  |  | 777.4 |
Due after Five Years to Ten Years |  | 1,329.0 |  |  | 1,378.5 |
Due after Ten Years |  | 2,009.5 |  |  | 2,277.1 |
Asset-backed Securities Not Due at a Single Maturity Date |  | 204.9 |  |  | 216.3 |
Investments in Fixed Maturities |  | $ | 4,318.5 |  |  | $ | 4,697.2 |
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, 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 |  | $ | 95.8 |  |  | $ | (10.9 | ) |  | $ | 4.4 |  |  | $ | (0.8 | ) |  | $ | 100.2 |  |  | $ | (11.7 | )
States and Political Subdivisions |  | 222.9 |  |  | (20.1 | ) |  | 2.0 |  |  | (0.1 | ) |  | 224.9 |  |  | (20.2 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 699.8 |  |  | (39.4 | ) |  | 103.2 |  |  | (8.3 | ) |  | 803.0 |  |  | (47.7 | )
Other Mortgage- and Asset-backed |  | 13.9 |  |  | (0.1 | ) |  | 1.1 |  |  | — |  |  | 15.0 |  |  | (0.1 | )
Total Fixed Maturities |  | 1,032.4 |  |  | (70.5 | ) |  | 110.7 |  |  | (9.2 | ) |  | 1,143.1 |  |  | (79.7 | )
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 22.5 |  |  | (2.5 | ) |  | 2.5 |  |  | — |  |  | 25.0 |  |  | (2.5 | )
Other Industries |  | 4.3 |  |  | (0.1 | ) |  | 0.7 |  |  | — |  |  | 5.0 |  |  | (0.1 | )
Common Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing |  | 5.0 |  |  | (0.1 | ) |  | 0.2 |  |  | — |  |  | 5.2 |  |  | (0.1 | )
Other Industries |  | 14.2 |  |  | (0.9 | ) |  | 0.5 |  |  | — |  |  | 14.7 |  |  | (0.9 | )
Other Equity Interests: |  |  |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 67.6 |  |  | (1.0 | ) |  | — |  |  | — |  |  | 67.6 |  |  | (1.0 | )
Limited Liability Companies and Limited Partnerships |  | 53.1 |  |  | (0.9 | ) |  | 5.0 |  |  | (0.7 | ) |  | 58.1 |  |  | (1.6 | )
Total Equity Securities |  | 166.7 |  |  | (5.5 | ) |  | 8.9 |  |  | (0.7 | ) |  | 175.6 |  |  | (6.2 | )
Total |  | $ | 1,199.1 |  |  | $ | (76.0 | ) |  | $ | 119.6 |  |  | $ | (9.9 | ) |  | $ | 1,318.7 |  |  | $ | (85.9 | )
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at September 30, 2014 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 |  | $ | 24.3 |  |  | $ | (1.4 | ) |  | $ | 65.3 |  |  | $ | (4.0 | ) |  | $ | 89.6 |  |  | $ | (5.4 | )
States and Political Subdivisions |  | 50.1 |  |  | (0.1 | ) |  | 154.8 |  |  | (4.2 | ) |  | 204.9 |  |  | (4.3 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 250.8 |  |  | (2.8 | ) |  | 409.4 |  |  | (15.6 | ) |  | 660.2 |  |  | (18.4 | )
Collateralized Loan Obligations |  | 36.2 |  |  | (0.3 | ) |  | 2.2 |  |  | (0.1 | ) |  | 38.4 |  |  | (0.4 | )
Other Mortgage- and Asset-backed |  | — |  |  | — |  |  | 0.7 |  |  | — |  |  | 0.7 |  |  | — |
Total Fixed Maturities |  | 361.4 |  |  | (4.6 | ) |  | 632.4 |  |  | (23.9 | ) |  | 993.8 |  |  | (28.5 | )
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 5.0 |  |  | — |  |  | 12.1 |  |  | (1.0 | ) |  | 17.1 |  |  | (1.0 | )
Other Industries |  | 0.7 |  |  | (0.1 | ) |  | 0.7 |  |  | — |  |  | 1.4 |  |  | (0.1 | )
Common Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing |  | 30.8 |  |  | (1.1 | ) |  | 0.3 |  |  | — |  |  | 31.1 |  |  | (1.1 | )
Other Industries |  | 12.0 |  |  | (0.7 | ) |  | — |  |  | — |  |  | 12.0 |  |  | (0.7 | )
Other Equity Interests: |  |  |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 51.2 |  |  | (0.2 | ) |  | 14.5 |  |  | (0.4 | ) |  | 65.7 |  |  | (0.6 | )
Limited Liability Companies and Limited Partnerships |  | 74.8 |  |  | (2.0 | ) |  | 2.4 |  |  | (0.3 | ) |  | 77.2 |  |  | (2.3 | )
Total Equity Securities |  | 174.5 |  |  | (4.1 | ) |  | 30.0 |  |  | (1.7 | ) |  | 204.5 |  |  | (5.8 | )
Total |  | $ | 535.9 |  |  | $ | (8.7 | ) |  | $ | 662.4 |  |  | $ | (25.6 | ) |  | $ | 1,198.3 |  |  | $ | (34.3 | )
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 the portion of the OTTI loss related to factors other than credit has been recognized in Accumulated Other Comprehensive Income, and the corresponding changes in such amounts.
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2014 |  | Sep 30, 2013 |  | Sep 30, 2014 |  | Sep 30, 2013
Balance at Beginning of Period |  | $ | 9.9 |  |  | $ | 4.6 |  |  | $ | 12.9 |  |  | $ | 4.4 |
Additions for Previously Unrecognized OTTI Credit Losses |  | 2.4 |  |  | 1.8 |  |  | — |  |  | 0.8 |
Increases to Previously Recognized OTTI Credit Losses |  | 0.6 |  |  | 1.3 |  |  | — |  |  | 1.3 |
Reductions for Change in Impairment Status: |  |  |  |  |  |  |  |
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell |  | (2.4 | ) |  | (3.2 | ) |  | (2.4 | ) |  | (2.1 | )
Reductions for Investments Sold During Period |  | — |  |  | (0.1 | ) |  | — |  |  | — |
Balance at End of Period |  | $ | 10.5 |  |  | $ | 4.4 |  |  | $ | 10.5 |  |  | $ | 4.4 |
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses on sales of investments in fixed maturities and equity securities for the nine and three months ended September 30, 2014 and 2013 were:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2014 |  | Sep 30, 2013 |  | Sep 30, 2014 |  | Sep 30, 2013
Fixed Maturities: |  |  |  |  |  |  |  |
Gains on Sales |  | $ | 5.0 |  |  | $ | 29.6 |  |  | $ | 0.2 |  |  | $ | 2.5 |
Equity Securities: |  |  |  |  |  |  |  |
Gains on Sales |  | 11.7 |  |  | 1.9 |  |  | 7.9 |  |  | 0.7 |
Losses on Sales |  | — |  |  | (0.3 | ) |  | — |  |  | (0.2 | )
Schedule of Other Investments [Table Text Block] | The carrying values of the Company’s Other Investments at September 30, 2014 and December 31, 2013 were:
(Dollars in Millions) |  | Sep 30, 2014 |  | Dec 31, 2013
Loans to Policyholders at Unpaid Principal |  | $ | 280.8 |  |  | $ | 275.4 |
Real Estate at Depreciated Cost |  | 164.3 |  |  | 167.1 |
Trading Securities at Fair Value |  | 5.0 |  |  | 5.0 |
Other |  | 0.4 |  |  | 0.5 |
Total |  | $ | 450.5 |  |  | $ | 448.0 |
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, 2013 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
(Dollars in Millions) |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 351.1 |  |  | $ | 22.8 |  |  | $ | (11.7 | ) |  | $ | 362.2 |
States and Political Subdivisions |  | 1,327.4 |  |  | 53.8 |  |  | (20.2 | ) |  | 1,361.0 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 2,636.4 |  |  | 205.0 |  |  | (47.7 | ) |  | 2,793.7 |
Redeemable Preferred Stocks |  | 6.6 |  |  | 0.8 |  |  | — |  |  | 7.4 |
Collateralized Loan Obligations |  | 44.2 |  |  | 0.5 |  |  | — |  |  | 44.7 |
Other Mortgage- and Asset-backed |  | 4.8 |  |  | 1.3 |  |  | (0.1 | ) |  | 6.0 |
Investments in Fixed Maturities |  | $ | 4,370.5 |  |  | $ | 284.2 |  |  | $ | (79.7 | ) |  | $ | 4,575.0 |
The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2014 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
(Dollars in Millions) |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 320.4 |  |  | $ | 28.5 |  |  | $ | (5.4 | ) |  | $ | 343.5 |
States and Political Subdivisions |  | 1,336.0 |  |  | 107.5 |  |  | (4.3 | ) |  | 1,439.2 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 2,589.4 |  |  | 268.0 |  |  | (18.4 | ) |  | 2,839.0 |
Redeemable Preferred Stocks |  | 6.2 |  |  | 1.2 |  |  | — |  |  | 7.4 |
Collateralized Loan Obligations |  | 62.5 |  |  | 0.4 |  |  | (0.4 | ) |  | 62.5 |
Other Mortgage- and Asset-backed |  | 4.0 |  |  | 1.6 |  |  | — |  |  | 5.6 |
Investments in Fixed Maturities |  | $ | 4,318.5 |  |  | $ | 407.2 |  |  | $ | (28.5 | ) |  | $ | 4,697.2 |
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 December 31, 2013 were:
|  |  |  | Gross Unrealized |  |
(Dollars in Millions) |  | Cost |  | Gains |  | Losses |  | Fair Value
Preferred Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | $ | 85.4 |  |  | $ | 2.9 |  |  | $ | (2.5 | ) |  | $ | 85.8 |
Other Industries |  | 20.1 |  |  | 4.4 |  |  | (0.1 | ) |  | 24.4 |
Common Stocks: |  |  |  |  |  |  |  |
Manufacturing |  | 83.4 |  |  | 21.3 |  |  | (0.1 | ) |  | 104.6 |
Other Industries |  | 68.8 |  |  | 17.0 |  |  | (0.9 | ) |  | 84.9 |
Other Equity Interests: |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 122.0 |  |  | 3.9 |  |  | (1.0 | ) |  | 124.9 |
Limited Liability Companies and Limited Partnerships |  | 150.3 |  |  | 25.2 |  |  | (1.6 | ) |  | 173.9 |
Investments in Equity Securities |  | $ | 530.0 |  |  | $ | 74.7 |  |  | $ | (6.2 | ) |  | $ | 598.5 |
Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at September 30, 2014 were:
|  |  |  | Gross Unrealized |  |
(Dollars in Millions) |  | Cost |  | Gains |  | Losses |  | Fair Value
Preferred Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | $ | 85.5 |  |  | $ | 4.9 |  |  | $ | (1.0 | ) |  | $ | 89.4 |
Other Industries |  | 20.2 |  |  | 5.6 |  |  | (0.1 | ) |  | 25.7 |
Common Stocks: |  |  |  |  |  |  |  |
Manufacturing |  | 84.8 |  |  | 25.9 |  |  | (1.1 | ) |  | 109.6 |
Other Industries |  | 67.3 |  |  | 22.6 |  |  | (0.7 | ) |  | 89.2 |
Other Equity Interests: |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 125.2 |  |  | 5.2 |  |  | (0.6 | ) |  | 129.8 |
Limited Liability Companies and Limited Partnerships |  | 164.3 |  |  | 55.7 |  |  | (2.3 | ) |  | 217.7 |
Investments in Equity Securities |  | $ | 547.3 |  |  | $ | 119.9 |  |  | $ | (5.8 | ) |  | $ | 661.4 |

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- Definition Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 + Details
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