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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information |
|  | Three Months Ended (Unaudited) |  | Year Ended
DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS |  | Mar 31, 2018 |  | Jun 30, 2018 |  | Sep 30, 2018 |  | Dec 31, 2018 |  | Dec 31, 2018
Revenues: |  |  |  |  |  |  |  |  |  |
Earned Premiums |  | $ | 609.8 |  |  | $ | 658.1 |  |  | $ | 1,052.9 |  |  | $ | 1,063.6 |  |  | $ | 3,384.4 |
Net Investment Income |  | 79.2 |  |  | 78.4 |  |  | 92.0 |  |  | 91.3 |  |  | 340.9 |
Other Income |  | 1.2 |  |  | 1.2 |  |  | 37.8 |  |  | 2.0 |  |  | 42.2 |
Income (Loss) from Changes in Fair Value of Equity and Convertible Securities |  | 0.7 |  |  | 0.4 |  |  | 11.0 |  |  | (76.4 | ) |  | (64.3 | )
Net Realized Gains on Sales of Investments |  | 2.6 |  |  | 3.8 |  |  | 3.6 |  |  | 16.4 |  |  | 26.4 |
Other-than-temporary Impairment Losses: |  |  |  |  |  |  |  |  |  |
Total Other-than-temporary Impairment Losses |  | (0.5 | ) |  | — |  |  | (1.8 | ) |  | (2.2 | ) |  | (4.5 | )
Portion of Losses Recognized in Other Comprehensive Income |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net Impairment Losses Recognized in Earnings |  | (0.5 | ) |  | — |  |  | (1.8 | ) |  | (2.2 | ) |  | (4.5 | )
Total Revenues |  | 693.0 |  |  | 741.9 |  |  | 1,195.5 |  |  | 1,094.7 |  |  | 3,725.1 |
Expenses: |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses |  | 436.9 |  |  | 499.5 |  |  | 757.3 |  |  | 772.8 |  |  | 2,466.5 |
Insurance Expenses |  | 160.1 |  |  | 171.2 |  |  | 296.0 |  |  | 273.2 |  |  | 900.5 |
Interest and Other Expenses |  | 29.0 |  |  | 25.7 |  |  | 61.7 |  |  | 42.6 |  |  | 159.0 |
Total Expenses |  | 626.0 |  |  | 696.4 |  |  | 1,115.0 |  |  | 1,088.6 |  |  | 3,526.0 |
Income (Loss) from Continuing Operations before Income Taxes |  | 67.0 |  |  | 45.5 |  |  | 80.5 |  |  | 6.1 |  |  | 199.1 |
Income Tax Benefit (Expense) |  | (13.4 | ) |  | (8.0 | ) |  | 11.8 |  |  | (1.1 | ) |  | (10.7 | )
Income (Loss) from Continuing Operations |  | 53.6 |  |  | 37.5 |  |  | 92.3 |  |  | 5.0 |  |  | 188.4 |
Income (Loss) from Discontinued Operations |  | 0.2 |  |  | 0.1 |  |  | (0.1 | ) |  | 1.5 |  |  | 1.7 |
Net Income (Loss) |  | $ | 53.8 |  |  | $ | 37.6 |  |  | $ | 92.2 |  |  | $ | 6.5 |  |  | $ | 190.1 |
Income (Loss) from Continuing Operations Per Unrestricted Share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.03 |  |  | $ | 0.73 |  |  | $ | 1.42 |  |  | $ | 0.08 |  |  | $ | 3.22 |
Diluted |  | $ | 1.02 |  |  | $ | 0.73 |  |  | $ | 1.40 |  |  | $ | 0.08 |  |  | $ | 3.19 |
Net Income (Loss) Per Unrestricted Share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.03 |  |  | $ | 0.73 |  |  | $ | 1.42 |  |  | $ | 0.10 |  |  | $ | 3.25 |
Diluted |  | $ | 1.02 |  |  | $ | 0.73 |  |  | $ | 1.40 |  |  | $ | 0.10 |  |  | $ | 3.22 |
Dividends Paid to Shareholders Per Share |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.96 |
The sum of quarterly per share amounts may not equal per share amounts for the year due to differences in weighted-average shares and/or equivalent shares outstanding for each of the periods presented. NOTE 25. QUARTERLY FINANCIAL INFORMATION (Unaudited) (Continued)
|  | Three Months Ended (Unaudited) |  | Year Ended
DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS |  | Mar 31, 2017 |  | Jun 30, 2017 |  | Sep 30, 2017 |  | Dec 31, 2017 |  | Dec 31, 2017
Revenues: |  |  |  |  |  |  |  |  |  |
Earned Premiums |  | $ | 563.4 |  |  | $ | 582.5 |  |  | $ | 598.2 |  |  | $ | 605.9 |  |  | $ | 2,350.0 |
Net Investment Income |  | 81.6 |  |  | 77.1 |  |  | 85.9 |  |  | 82.6 |  |  | 327.2 |
Other Income |  | 0.9 |  |  | 1.0 |  |  | 1.0 |  |  | 1.1 |  |  | 4.0 |
Net Realized Gains on Sales of Investments |  | 10.5 |  |  | 26.4 |  |  | 8.1 |  |  | 11.5 |  |  | 56.5 |
Other-than-temporary Impairment Losses: |  |  |  |  |  |  |  |  |  |
Total Other-than-temporary Impairment Losses |  | (5.2 | ) |  | (2.6 | ) |  | (2.9 | ) |  | (3.7 | ) |  | (14.4 | )
Portion of Losses Recognized in Other Comprehensive Income |  | 0.2 |  |  | — |  |  | — |  |  | (0.1 | ) |  | 0.1 |
Net Impairment Losses Recognized in Earnings |  | (5.0 | ) |  | (2.6 | ) |  | (2.9 | ) |  | (3.8 | ) |  | (14.3 | )
Total Revenues |  | 651.4 |  |  | 684.4 |  |  | 690.3 |  |  | 697.3 |  |  | 2,723.4 |
Expenses: |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses |  | 477.4 |  |  | 447.4 |  |  | 440.1 |  |  | 472.5 |  |  | 1,837.4 |
Insurance Expenses |  | 158.0 |  |  | 163.5 |  |  | 163.7 |  |  | 159.1 |  |  | 644.3 |
Interest and Other Expenses |  | 19.5 |  |  | 21.4 |  |  | 18.2 |  |  | 21.5 |  |  | 80.6 |
Total Expenses |  | 654.9 |  |  | 632.3 |  |  | 622.0 |  |  | 653.1 |  |  | 2,562.3 |
Income (Loss) from Continuing Operations before Income Taxes |  | (3.5 | ) |  | 52.1 |  |  | 68.3 |  |  | 44.2 |  |  | 161.1 |
Income Tax Benefit (Expense) |  | 3.1 |  |  | (15.5 | ) |  | (20.5 | ) |  | (8.3 | ) |  | (41.2 | )
Income from Continuing Operations |  | (0.4 | ) |  | 36.6 |  |  | 47.8 |  |  | 35.9 |  |  | 119.9 |
Income (Loss) from Discontinued Operations |  | 0.1 |  |  | — |  |  | (0.1 | ) |  | 1.0 |  |  | 1.0 |
Net Income |  | $ | (0.3 | ) |  | $ | 36.6 |  |  | $ | 47.7 |  |  | $ | 36.9 |  |  | $ | 120.9 |
Income from Continuing Operations Per Unrestricted Share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.01 | ) |  | $ | 0.71 |  |  | $ | 0.92 |  |  | $ | 0.69 |  |  | $ | 2.32 |
Diluted |  | $ | (0.01 | ) |  | $ | 0.71 |  |  | $ | 0.92 |  |  | $ | 0.69 |  |  | $ | 2.31 |
Net Income Per Unrestricted Share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.01 | ) |  | $ | 0.71 |  |  | $ | 0.92 |  |  | $ | 0.71 |  |  | $ | 2.34 |
Diluted |  | $ | (0.01 | ) |  | $ | 0.71 |  |  | $ | 0.92 |  |  | $ | 0.71 |  |  | $ | 2.33 |
Dividends Paid to Shareholders Per Share |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.96 |
The sum of quarterly per share amounts may not equal per share amounts for the year due to differences in weighted-average shares and/or equivalent shares outstanding for each of the periods presented.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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