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Investments (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Securities, Available-for-sale [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 March 31, 2019 by contractual maturity were:
(Dollars in Millions) |  | Amortized Cost |  | Fair Value
Due in One Year or Less |  | $ | 90.1 |  |  | $ | 90.9 |
Due after One Year to Five Years |  | 905.9 |  |  | 921.6 |
Due after Five Years to Ten Years |  | 1,658.4 |  |  | 1,731.8 |
Due after Ten Years |  | 2,434.4 |  |  | 2,649.2 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date |  | 1,178.1 |  |  | 1,179.6 |
Investments in Fixed Maturities |  | $ | 6,266.9 |  |  | $ | 6,573.1 |
Schedule of Unrealized Loss on Investments [Table Text Block] | An aging of unrealized losses on the Company’s Investments in Fixed Maturities at March 31, 2019 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 |  | $ | 13.2 |  |  | $ | (0.2 | ) |  | $ | 262.2 |  |  | $ | (7.5 | ) |  | $ | 275.4 |  |  | $ | (7.7 | )
States and Political Subdivisions |  | 1.6 |  |  | (0.3 | ) |  | 77.8 |  |  | (1.4 | ) |  | 79.4 |  |  | (1.7 | )
Foreign Governments |  | 4.4 |  |  | (0.5 | ) |  | 0.5 |  |  | (0.1 | ) |  | 4.9 |  |  | (0.6 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 222.6 |  |  | (5.2 | ) |  | 321.4 |  |  | (12.6 | ) |  | 544.0 |  |  | (17.8 | )
Collateralized Loan Obligations |  | 406.6 |  |  | (6.0 | ) |  | 28.7 |  |  | (0.8 | ) |  | 435.3 |  |  | (6.8 | )
Other Mortgage- and Asset-backed |  | — |  |  | — |  |  | 4.6 |  |  | — |  |  | 4.6 |  |  | — |
Total Fixed Maturities |  | 648.4 |  |  | (12.2 | ) |  | 695.2 |  |  | (22.4 | ) |  | 1,343.6 |  |  | (34.6 | )
The Company regularly reviews its fixed maturity investment portfolio for factors that may indicate that a decline in fair value of an investment is other than temporary. The portions of the declines in the fair values of fixed maturity investments that are determined to be other than temporary are reported as losses in the Condensed Consolidated Statements of Income in the periods when such determinations are made. Unrealized losses on fixed maturities, which the Company has determined to be temporary at March 31, 2019, were $34.6 million, of which $22.4 million was related to fixed maturities that were in an unrealized loss position for 12 months or longer. There were no unrealized losses at March 31, 2019 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “Less Than 12 Months.” There were no unrealized losses at March 31, 2019 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “12 Months or Longer.” Investment-grade fixed maturity investments comprised $23.1 million and below-investment-grade fixed maturity investments comprised $11.5 million of the unrealized losses on investments in fixed maturities at March 31, 2019. For below-investment-grade fixed maturity investments in an unrealized loss position, the unrealized loss amount, on average, was approximately 4% of the amortized cost basis of the investment. At March 31, 2019, the Company did not have the intent to sell these investments, and it was not more likely than not that the Company would be required to sell these investments before it recovered the amortized cost of such investments, which may be at maturity. Based on the Company’s Note 3 - Investments (continued) evaluation of the prospects of the issuers at March 31, 2019, including, but not limited to, the credit ratings of the issuers of the investments in the fixed maturities, and the Company’s intention to not sell and its determination that it would not be required to sell before it recovered the amortized cost of such investments, the Company concluded that the declines in the fair values of the Company’s investments in fixed maturities presented in the preceding table were temporary at the evaluation date. An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2018 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 |  | $ | 401.1 |  |  | $ | (7.6 | ) |  | $ | 79.0 |  |  | $ | (7.4 | ) |  | $ | 480.1 |  |  | $ | (15.0 | )
States and Political Subdivisions |  | 299.4 |  |  | (5.0 | ) |  | 102.6 |  |  | (3.6 | ) |  | 402.0 |  |  | (8.6 | )
Foreign Governments |  | 4.9 |  |  | (0.6 | ) |  | — |  |  | — |  |  | 4.9 |  |  | (0.6 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 1,326.0 |  |  | (38.2 | ) |  | 116.8 |  |  | (10.9 | ) |  | 1,442.8 |  |  | (49.1 | )
Collateralized Loan Obligations |  | 439.2 |  |  | (13.2 | ) |  | — |  |  | — |  |  | 439.2 |  |  | (13.2 | )
Other Mortgage- and Asset-backed |  | 0.2 |  |  | — |  |  | 4.5 |  |  | (0.1 | ) |  | 4.7 |  |  | (0.1 | )
Total Fixed Maturities |  | 2,470.8 |  |  | (64.6 | ) |  | 302.9 |  |  | (22.0 | ) |  | 2,773.7 |  |  | (86.6 | )
Unrealized losses on fixed maturities, which the Company determined to be temporary at December 31, 2018, were $86.6 million, of which $22.0 million was related to fixed maturities that were in an unrealized loss position for 12 months or longer. There were no unrealized losses at December 31, 2018 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “Less Than 12 Months.” There were no unrealized losses at December 31, 2018 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “12 Months or Longer.” Investment-grade fixed maturity investments comprised $69.5 million and below-investment-grade fixed maturity investments comprised $17.1 million of the unrealized losses on investments in fixed maturities at December 31, 2018. For below-investment-grade fixed maturity investments in an unrealized loss position, the unrealized loss amount, on average, was approximately 5% of the amortized cost basis of the investment. At December 31, 2018, the Company did not have the intent to sell these investments, and it was not more likely than not that the Company would be required to sell these investments before recovery of its amortized cost basis, which may be at maturity. Based on the Company’s evaluation at December 31, 2018 of the prospects of the issuers, including, but not limited to, the credit ratings of the issuers of the investments in the fixed maturities, and the Company’s intention to not sell and its determination that it would not be required to sell before recovery of the amortized cost of such investments, the Company concluded that the declines in the fair values of the Company’s investments in fixed maturities presented in the preceding table were temporary at the evaluation date.
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 beginning and end of the periods presented 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.Note 3 - Investments (continued)
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2019 |  | Mar 31, 2018
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Period |  | $ | 1.1 |  |  | $ | 1.6 |
Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Period |  | 0.1 |  |  | — |
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at End of Period |  | $ | 1.2 |  |  | $ | 1.6 |
Investment Income [Table Text Block] | Net Investment Income for the three months ended March 31, 2019 and 2018 was:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2019 |  | Mar 31, 2018
Investment Income: |  |  |  |
Interest on Fixed Income Securities |  | $ | 76.4 |  |  | $ | 62.4 |
Dividends on Equity Securities Excluding Alternative Investments |  | 2.5 |  |  | 1.9 |
Alternative Investments: |  |  |  |
Equity Method Limited Liability Investments |  | (3.6 | ) |  | 7.1 |
Limited Liability Investments Included in Equity Securities |  | 2.6 |  |  | 3.9 |
Total Alternative Investments |  | (1.0 | ) |  | 11.0 |
Short-term Investments |  | 1.8 |  |  | 0.8 |
Loans to Policyholders |  | 5.3 |  |  | 5.5 |
Real Estate |  | 2.5 |  |  | 2.4 |
Total Investment Income |  | 87.5 |  |  | 84.0 |
Investment Expenses: |  |  |  |
Real Estate |  | 2.4 |  |  | 2.3 |
Other Investment Expenses |  | 2.4 |  |  | 2.5 |
Total Investment Expenses |  | 4.8 |  |  | 4.8 |
Net Investment Income |  | $ | 82.7 |  |  | $ | 79.2 |
Schedule of Realized Gain (Loss) [Table Text Block] | Gross gains and losses on sales of investments in fixed maturities for the three months ended March 31, 2019 and 2018 were:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2019 |  | Mar 31, 2018
Fixed Maturities: |  |  |  |
Gains on Sales |  | $ | 15.1 |  |  | $ | 4.1 |
Losses on Sales |  | (2.6 | ) |  | (2.1 | )
Schedule of Other Investments [Table Text Block] | The carrying values of the Company’s Other Investments at March 31, 2019 and December 31, 2018 were:
(Dollars in Millions) |  | Mar 31, 2019 |  | Dec 31, 2018
Loans to Policyholders at Unpaid Principal |  | $ | 301.4 |  |  | $ | 300.6 |
Real Estate at Depreciated Cost |  | 113.6 |  |  | 114.2 |
Mortgage Loans |  | 10.6 |  |  | — |
Total |  | $ | 425.6 |  |  | $ | 414.8 |
Investments in Fixed Maturities |
Debt Securities, Available-for-sale [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 March 31, 2019 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
(Dollars in Millions) |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 845.9 |  |  | $ | 20.2 |  |  | $ | (7.7 | ) |  | $ | 858.4 |
States and Political Subdivisions |  | 1,582.2 |  |  | 101.4 |  |  | (1.7 | ) |  | 1,681.9 |
Foreign Governments |  | 5.8 |  |  | — |  |  | (0.6 | ) |  | 5.2 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 3,281.5 |  |  | 216.4 |  |  | (17.8 | ) |  | 3,480.1 |
Collateralized Loan Obligations |  | 536.8 |  |  | 1.5 |  |  | (6.8 | ) |  | 531.5 |
Other Mortgage- and Asset-backed |  | 14.7 |  |  | 1.3 |  |  | — |  |  | 16.0 |
Investments in Fixed Maturities |  | $ | 6,266.9 |  |  | $ | 340.8 |  |  | $ | (34.6 | ) |  | $ | 6,573.1 |
The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2018 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
(Dollars in Millions) |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 865.9 |  |  | $ | 14.8 |  |  | $ | (15.0 | ) |  | $ | 865.7 |
States and Political Subdivisions |  | 1,553.7 |  |  | 74.0 |  |  | (8.6 | ) |  | 1,619.1 |
Foreign Governments |  | 6.5 |  |  | — |  |  | (0.6 | ) |  | 5.9 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 3,307.8 |  |  | 135.1 |  |  | (49.1 | ) |  | 3,393.8 |
Collateralized Loan Obligations |  | 535.7 |  |  | 1.5 |  |  | (13.2 | ) |  | 524.0 |
Other Mortgage- and Asset-backed |  | 14.9 |  |  | 0.9 |  |  | (0.1 | ) |  | 15.7 |
Investments in Fixed Maturities |  | $ | 6,284.5 |  |  | $ | 226.3 |  |  | $ | (86.6 | ) |  | $ | 6,424.2 |

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