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Discontinued Operations (Tables) | 12 Months Ended
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Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract] |
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures | Summary financial information included in Income from Discontinued Operations for the years ended December 31, 2018, 2017 and 2016 is presented below.
DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS |  | 2018 |  | 2017 |  | 2016
Income from Discontinued Operations before Income Taxes: |  |  |  |  |  |
Change in Estimate of Retained Liabilities Arising from Discontinued Operations |  | $ | 2.4 |  |  | $ | 1.5 |  |  | $ | 6.3 |
Income Tax Expense |  | (0.7 | ) |  | (0.5 | ) |  | (2.2 | )
Income from Discontinued Operations |  | $ | 1.7 |  |  | $ | 1.0 |  |  | $ | 4.1 |
Income from Discontinued Operations Per Unrestricted Share: |  |  |  |  |  |
Basic |  | $ | 0.03 |  |  | $ | 0.02 |  |  | $ | 0.08 |
Diluted |  | $ | 0.03 |  |  | $ | 0.02 |  |  | $ | 0.08 |

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