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Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |
Schedule of Unrealized Loss on Investments | An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at December 31, 2015 is presented below.
DOLLARS IN MILLIONS |  | Less Than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 56.6 |  |  | $ | (1.6 | ) |  | $ | 24.1 |  |  | $ | (2.0 | ) |  | $ | 80.7 |  |  | $ | (3.6 | )
States and Political Subdivisions |  | 131.0 |  |  | (2.6 | ) |  | 0.9 |  |  | (0.1 | ) |  | 131.9 |  |  | (2.7 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 783.8 |  |  | (26.0 | ) |  | 133.6 |  |  | (14.7 | ) |  | 917.4 |  |  | (40.7 | )
Collateralized Loan Obligations |  | 57.4 |  |  | (2.9 | ) |  | 0.8 |  |  | (0.1 | ) |  | 58.2 |  |  | (3.0 | )
Other Mortgage- and Asset-backed |  | — |  |  | — |  |  | 0.3 |  |  | — |  |  | 0.3 |  |  | — |
Total Fixed Maturities |  | 1,028.8 |  |  | (33.1 | ) |  | 159.7 |  |  | (16.9 | ) |  | 1,188.5 |  |  | (50.0 | )
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 2.7 |  |  | — |  |  | 12.3 |  |  | (0.8 | ) |  | 15.0 |  |  | (0.8 | )
Other Industries |  | 7.3 |  |  | (0.8 | ) |  | — |  |  | — |  |  | 7.3 |  |  | (0.8 | )
Common Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 16.3 |  |  | (1.0 | ) |  | — |  |  | — |  |  | 16.3 |  |  | (1.0 | )
Other Industries |  | 2.8 |  |  | (0.3 | ) |  | — |  |  | — |  |  | 2.8 |  |  | (0.3 | )
Other Equity Interests: |  |  |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 135.2 |  |  | (3.7 | ) |  | — |  |  | — |  |  | 135.2 |  |  | (3.7 | )
Limited Liability Companies and Limited Partnerships |  | 2.7 |  |  | (0.5 | ) |  | — |  |  | — |  |  | 2.7 |  |  | (0.5 | )
Total Equity Securities |  | 167.0 |  |  | (6.3 | ) |  | 12.3 |  |  | (0.8 | ) |  | 179.3 |  |  | (7.1 | )
Total |  | $ | 1,195.8 |  |  | $ | (39.4 | ) |  | $ | 172.0 |  |  | $ | (17.7 | ) |  | $ | 1,367.8 |  |  | $ | (57.1 | )
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at December 31, 2014 is presented below.
DOLLARS IN MILLIONS |  | Less Than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 24.9 |  |  | $ | (0.7 | ) |  | $ | 55.5 |  |  | $ | (1.3 | ) |  | $ | 80.4 |  |  | $ | (2.0 | )
States and Political Subdivisions |  | 1.0 |  |  | — |  |  | 126.3 |  |  | (1.8 | ) |  | 127.3 |  |  | (1.8 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 250.4 |  |  | (5.1 | ) |  | 360.5 |  |  | (10.0 | ) |  | 610.9 |  |  | (15.1 | )
Redeemable Preferred Stocks |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Collateralized Loan Obligations |  | 51.2 |  |  | (0.7 | ) |  | 3.4 |  |  | (0.1 | ) |  | 54.6 |  |  | (0.8 | )
Other Mortgage- and Asset-backed |  | — |  |  | — |  |  | 0.4 |  |  | — |  |  | 0.4 |  |  | — |
Total Fixed Maturities |  | 327.5 |  |  | (6.5 | ) |  | 546.1 |  |  | (13.2 | ) |  | 873.6 |  |  | (19.7 | )
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 7.5 |  |  | (0.1 | ) |  | 12.1 |  |  | (0.9 | ) |  | 19.6 |  |  | (1.0 | )
Other Industries |  | — |  |  | — |  |  | 0.5 |  |  | — |  |  | 0.5 |  |  | — |
Common Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing |  | 15.1 |  |  | (1.1 | ) |  | — |  |  | — |  |  | 15.1 |  |  | (1.1 | )
Other Industries |  | 4.2 |  |  | (0.4 | ) |  | 1.0 |  |  | — |  |  | 5.2 |  |  | (0.4 | )
Other Equity Interests: |  |  |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 14.9 |  |  | (0.1 | ) |  | 14.4 |  |  | (0.6 | ) |  | 29.3 |  |  | (0.7 | )
Limited Liability Companies and Limited Partnerships |  | 54.4 |  |  | (1.5 | ) |  | 6.6 |  |  | (0.3 | ) |  | 61.0 |  |  | (1.8 | )
Total Equity Securities |  | 96.1 |  |  | (3.2 | ) |  | 34.6 |  |  | (1.8 | ) |  | 130.7 |  |  | (5.0 | )
Total |  | $ | 423.6 |  |  | $ | (9.7 | ) |  | $ | 580.7 |  |  | $ | (15.0 | ) |  | $ | 1,004.3 |  |  | $ | (24.7 | )
Other than Temporary Impairment, Credit Losses Recognized in Earnings | The following table sets forth the pre-tax amount of OTTI credit losses, recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of December 31, 2015, 2014 and 2013, for which a portion of the OTTI loss related to factors other than credit has been recognized in AOCI, and the corresponding changes in such amounts.
DOLLARS IN MILLIONS |  | 2015 |  | 2014 |  | 2013
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Year |  | $ | 5.3 |  |  | $ | 9.9 |  |  | $ | 4.6 |
Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Year |  | 0.2 |  |  | 2.4 |  |  | 1.8 |
Additional Pre-tax Credit Losses on Fixed Maturities with Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Year |  | — |  |  | 0.6 |  |  | 7.3 |
Reductions for Change in Impairment Status: |  |  |  |  |  |
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell |  | (0.4 | ) |  | (2.4 | ) |  | (3.2 | )
Reductions for Investments Sold During Year |  | — |  |  | (5.2 | ) |  | (0.6 | )
Balance at End of Year |  | $ | 5.1 |  |  | $ | 5.3 |  |  | $ | 9.9 |
The components of Net Impairment Losses Recognized in Earnings reported in the Consolidated Statements of Income for the years ended December 31, 2015, 2014 and 2013 were:
DOLLARS IN MILLIONS |  | 2015 |  | 2014 |  | 2013
Fixed Maturities |  | $ | (11.5 | ) |  | $ | (5.7 | ) |  | $ | (10.3 | )
Equity Securities |  | (15.7 | ) |  | (7.1 | ) |  | (3.6 | )
Real Estate |  | — |  |  | (2.4 | ) |  | — |
Net Impairment Losses Recognized in Earnings |  | $ | (27.2 | ) |  | $ | (15.2 | ) |  | $ | (13.9 | )
Schedule of Other Investments | The carrying values of the Company’s Other Investments at December 31, 2015 and 2014 were:
DOLLARS IN MILLIONS |  | 2015 |  | 2014
Loans to Policyholders at Unpaid Principal |  | $ | 288.4 |  |  | $ | 283.4 |
Real Estate at Depreciated Cost |  | 149.8 |  |  | 160.9 |
Trading Securities at Fair Value |  | 4.7 |  |  | 4.9 |
Other |  | 0.3 |  |  | 0.4 |
Total |  | $ | 443.2 |  |  | $ | 449.6 |
Investments in Fixed Maturities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Schedule of Available-for-sale Securities Reconciliation | The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2014 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
DOLLARS IN MILLIONS |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 315.2 |  |  | $ | 32.3 |  |  | $ | (2.0 | ) |  | $ | 345.5 |
States and Political Subdivisions |  | 1,352.5 |  |  | 126.4 |  |  | (1.8 | ) |  | 1,477.1 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 2,599.3 |  |  | 294.3 |  |  | (15.1 | ) |  | 2,878.5 |
Redeemable Preferred Stocks |  | 5.9 |  |  | 0.8 |  |  | — |  |  | 6.7 |
Collateralized Loan Obligations |  | 64.9 |  |  | 0.3 |  |  | (0.8 | ) |  | 64.4 |
Other Mortgage- and Asset-backed |  | 3.9 |  |  | 1.5 |  |  | — |  |  | 5.4 |
Investments in Fixed Maturities |  | $ | 4,341.7 |  |  | $ | 455.6 |  |  | $ | (19.7 | ) |  | $ | 4,777.6 |
The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2015 were:
DOLLARS IN MILLIONS |  | Amortized Cost |  | Gross Unrealized |  | Fair Value
Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 298.0 |  |  | $ | 26.2 |  |  | $ | (3.6 | ) |  | $ | 320.6 |
States and Political Subdivisions |  | 1,513.7 |  |  | 111.6 |  |  | (2.7 | ) |  | 1,622.6 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 2,651.5 |  |  | 202.0 |  |  | (40.7 | ) |  | 2,812.8 |
Redeemable Preferred Stocks |  | 3.7 |  |  | 0.1 |  |  | — |  |  | 3.8 |
Collateralized Loan Obligations |  | 90.0 |  |  | 0.3 |  |  | (3.0 | ) |  | 87.3 |
Other Mortgage- and Asset-backed |  | 3.8 |  |  | 1.4 |  |  | — |  |  | 5.2 |
Investments in Fixed Maturities |  | $ | 4,560.7 |  |  | $ | 341.6 |  |  | $ | (50.0 | ) |  | $ | 4,852.3 |
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2015 by contractual maturity were:
DOLLARS IN MILLIONS |  | Amortized Cost |  | Fair Value
Due in One Year or Less |  | $ | 52.4 |  |  | $ | 54.6 |
Due after One Year to Five Years |  | 806.8 |  |  | 840.2 |
Due after Five Years to Ten Years |  | 1,475.3 |  |  | 1,507.1 |
Due after Ten Years |  | 2,009.5 |  |  | 2,227.9 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date |  | 216.7 |  |  | 222.5 |
Investments in Fixed Maturities |  | $ | 4,560.7 |  |  | $ | 4,852.3 |
Investments in Equity Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Schedule of Available-for-sale Securities Reconciliation | Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at December 31, 2015 were:
DOLLARS IN MILLIONS |  | Cost |  | Gross Unrealized |  | Fair Value
Gains |  | Losses |
Preferred Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | $ | 80.8 |  |  | $ | 4.9 |  |  | $ | (0.8 | ) |  | $ | 84.9 |
Other Industries |  | 17.1 |  |  | 2.7 |  |  | (0.8 | ) |  | 19.0 |
Common Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 18.9 |  |  | 5.3 |  |  | (1.0 | ) |  | 23.2 |
Other Industries |  | 9.4 |  |  | 4.3 |  |  | (0.2 | ) |  | 13.5 |
Other Equity Interests: |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 179.7 |  |  | 1.1 |  |  | (3.7 | ) |  | 177.1 |
Limited Liability Companies and Limited Partnerships |  | 181.0 |  |  | 25.0 |  |  | (0.5 | ) |  | 205.5 |
Investments in Equity Securities |  | $ | 486.9 |  |  | $ | 43.3 |  |  | $ | (7.0 | ) |  | $ | 523.2 |
Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at December 31, 2014 were:
DOLLARS IN MILLIONS |  |  |  | Gross Unrealized |  |
| Cost |  | Gains |  | Losses |  | Fair Value
Preferred Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | $ | 85.5 |  |  | $ | 5.2 |  |  | $ | (1.0 | ) |  | $ | 89.7 |
Other Industries |  | 16.3 |  |  | 3.5 |  |  | — |  |  | 19.8 |
Common Stocks: |  |  |  |  |  |  |  |
Manufacturing |  | 43.4 |  |  | 14.9 |  |  | (1.1 | ) |  | 57.2 |
Finance, Insurance and Real Estate |  | 34.3 |  |  | 6.2 |  |  | — |  |  | 40.5 |
Other Industries |  | 26.5 |  |  | 10.0 |  |  | (0.4 | ) |  | 36.1 |
Other Equity Interests: |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 195.2 |  |  | 8.2 |  |  | (0.7 | ) |  | 202.7 |
Limited Liability Companies and Limited Partnerships |  | 160.3 |  |  | 27.7 |  |  | (1.8 | ) |  | 186.2 |
Investments in Equity Securities |  | $ | 561.5 |  |  | $ | 75.7 |  |  | $ | (5.0 | ) |  | $ | 632.2 |

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