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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |
Schedule of Unrealized Loss on Investments | An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2018 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 |  | $ | 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 | )
An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2017 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 |  | $ | 140.0 |  |  | $ | (1.1 | ) |  | $ | 103.4 |  |  | $ | (5.1 | ) |  | $ | 243.4 |  |  | $ | (6.2 | )
States and Political Subdivisions |  | 57.0 |  |  | (0.3 | ) |  | 124.2 |  |  | (2.0 | ) |  | 181.2 |  |  | (2.3 | )
Corporate Securities: |  |  |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | 283.1 |  |  | (4.2 | ) |  | 208.9 |  |  | (6.8 | ) |  | 492.0 |  |  | (11.0 | )
Collateralized Loan Obligations |  | 2.8 |  |  | — |  |  | 2.4 |  |  | — |  |  | 5.2 |  |  | — |
Total Fixed Maturities |  | $ | 482.9 |  |  | $ | (5.6 | ) |  | $ | 438.9 |  |  | $ | (13.9 | ) |  | $ | 921.8 |  |  | $ | (19.5 | )
Other than Temporary Impairment, Credit Losses Recognized in Earnings | The following table sets forth the pre-tax amount of Other Than Temporary Impairments (“OTTI”) credit losses, recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of December 31, 2018, 2017 and 2016, 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 |  | 2018 |  | 2017 |  | 2016
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Year |  | $ | 1.6 |  |  | $ | 1.4 |  |  | $ | 5.1 |
Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Year |  | — |  |  | 1.2 |  |  | 2.7 |
Reductions for Change in Impairment Status: |  |  |  |  |  |
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell |  | (0.5 | ) |  | (0.7 | ) |  | (6.3 | )
Reductions for Investments Sold During Year |  | — |  |  | (0.3 | ) |  | (0.1 | )
Balance at End of Year |  | $ | 1.1 |  |  | $ | 1.6 |  |  | $ | 1.4 |
The components of Net Impairment Losses Recognized in Earnings reported in the Consolidated Statements of Income for the years ended December 31, 2018, 2017 and 2016 were:
DOLLARS IN MILLIONS |  | 2018 |  | 2017 |  | 2016
Fixed Maturities |  | $ | (2.0 | ) |  | $ | (12.1 | ) |  | $ | (26.6 | )
Equity Securities |  | (2.5 | ) |  | (2.2 | ) |  | (5.6 | )
Real Estate |  | — |  |  | — |  |  | (0.5 | )
Net Impairment Losses Recognized in Earnings |  | $ | (4.5 | ) |  | $ | (14.3 | ) |  | $ | (32.7 | )
Schedule of Other Investments | The carrying values of the Company’s Other Investments at December 31, 2018 and 2017 were:
DOLLARS IN MILLIONS |  | 2018 |  | 2017
Loans to Policyholders at Unpaid Principal |  | $ | 300.6 |  |  | $ | 298.6 |
Real Estate at Depreciated Cost |  | 114.2 |  |  | 116.8 |
Trading Securities at Fair Value |  | — |  |  | 6.7 |
Other |  | — |  |  | 0.1 |
Total |  | $ | 414.8 |  |  | $ | 422.2 |
Equity Securities without Readily Determinable Fair Value [Table Text Block] | Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at Fair Value at December 31, 2017 is presented below.
DOLLARS IN MILLIONS |  | Cost |  | Gross Unrealized |  | Fair Value
Gains |  | Losses |
Preferred Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | $ | 51.1 |  |  | $ | 4.6 |  |  | $ | — |  |  | $ | 55.7 |
Other Industries |  | 17.1 |  |  | 6.0 |  |  | — |  |  | 23.1 |
Common Stocks: |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 5.5 |  |  | 1.7 |  |  | (0.1 | ) |  | 7.1 |
Other Industries |  | 10.0 |  |  | 8.1 |  |  | (0.4 | ) |  | 17.7 |
Other Equity Interests: |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 207.6 |  |  | 11.9 |  |  | — |  |  | 219.5 |
Limited Liability Companies and Limited Partnerships |  | 184.9 |  |  | 23.9 |  |  | (5.9 | ) |  | 202.9 |
Investments in Equity Securities at Fair Value |  | $ | 476.2 |  |  | $ | 56.2 |  |  | $ | (6.4 | ) |  | $ | 526.0 |
An aging of unrealized losses on the Company’s Investments in Equity Securities at Fair Value at December 31, 2017 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
Preferred Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 0.3 |  |  | — |  |  | 0.2 |  |  | — |  |  | 0.5 |  |  | — |
Other Industries |  | 0.2 |  |  | — |  |  | 0.2 |  |  | — |  |  | 0.4 |  |  | — |
Common Stocks: |  |  |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 1.6 |  |  | (0.1 | ) |  | — |  |  | — |  |  | 1.6 |  |  | (0.1 | )
Other Industries |  | 0.4 |  |  | (0.3 | ) |  | 0.5 |  |  | (0.1 | ) |  | 0.9 |  |  | (0.4 | )
Other Equity Interests: |  |  |  |  |  |  |  |  |  |  |  |
Limited Liability Companies and Limited Partnerships |  | 48.4 |  |  | (2.1 | ) |  | 7.7 |  |  | (3.8 | ) |  | 56.1 |  |  | (5.9 | )
Investments in Equity Securities at Fair Value |  | $ | 50.9 |  |  | $ | (2.5 | ) |  | $ | 8.6 |  |  | $ | (3.9 | ) |  | $ | 59.5 |  |  | $ | (6.4 | )
Investments in Fixed Maturities [Member] |
Debt Securities, Available-for-sale [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, 2018 were:
DOLLARS IN MILLIONS |  | Amortized Cost |  | Gross Unrealized |  | Fair Value
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 |
The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2017 were:
|  | Amortized Cost |  | Gross Unrealized |  | Fair Value
DOLLARS IN MILLIONS |  | Gains |  | Losses |
U.S. Government and Government Agencies and Authorities |  | $ | 542.7 |  |  | $ | 19.6 |  |  | $ | (6.2 | ) |  | $ | 556.1 |
States and Political Subdivisions |  | 1,595.5 |  |  | 108.6 |  |  | (2.3 | ) |  | 1,701.8 |
Foreign Governments |  | 3.0 |  |  | 0.2 |  |  | — |  |  | 3.2 |
Corporate Securities: |  |  |  |  |  |  |  |
Bonds and Notes |  | 2,745.8 |  |  | 245.8 |  |  | (11.0 | ) |  | 2,980.6 |
Redeemable Preferred Stocks |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Collateralized Loan Obligations |  | 134.1 |  |  | 5.7 |  |  | — |  |  | 139.8 |
Other Mortgage- and Asset-backed |  | 0.4 |  |  | 0.7 |  |  | — |  |  | 1.1 |
Investments in Fixed Maturities |  | $ | 5,021.6 |  |  | $ | 380.6 |  |  | $ | (19.5 | ) |  | $ | 5,382.7 |
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2018 by contractual maturity were:
DOLLARS IN MILLIONS |  | Amortized Cost |  | Fair Value
Due in One Year or Less |  | $ | 130.3 |  |  | $ | 131.0 |
Due after One Year to Five Years |  | 914.3 |  |  | 917.7 |
Due after Five Years to Ten Years |  | 1,816.8 |  |  | 1,842.5 |
Due after Ten Years |  | 2,234.8 |  |  | 2,358.9 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date |  | 1,188.3 |  |  | 1,174.1 |
Investments in Fixed Maturities |  | $ | 6,284.5 |  |  | $ | 6,424.2 |
Investments in Equity Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Schedule of Available-for-sale Securities Reconciliation |

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