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Income From Continuing Operations Per Unrestricted Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | A reconciliation of the numerator and denominator used in the calculation of Basic Income from Continuing Operations Per Unrestricted Share and Diluted Income from Continuing Operations Per Unrestricted Share for the years ended December 31, 2017, 2016 and 2015 is presented below.
|  | 2017 |  | 2016 |  | 2015
DOLLARS IN MILLIONS |  |  |  |  |  |
Income from Continuing Operations |  | $ | 119.9 |  |  | $ | 12.7 |  |  | $ | 80.2 |
Less Income (Loss) from Continuing Operations Attributed to Participating Awards |  | 0.8 |  |  | (0.2 | ) |  | 0.4 |
Income from Continuing Operations Attributed to Unrestricted Shares |  | 119.1 |  |  | 12.9 |  |  | 79.8 |
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares |  | — |  |  | — |  |  | — |
Diluted Income from Continuing Operations Attributed to Unrestricted Shares |  | $ | 119.1 |  |  | $ | 12.9 |  |  | $ | 79.8 |
SHARES IN THOUSANDS |  |  |  |  |  |
Weighted-average Unrestricted Shares Outstanding |  | 51,345.6 |  |  | 51,156.1 |  |  | 51,606.9 |
Equity-based Compensation Equivalent Shares |  | 232.3 |  |  | 58.6 |  |  | 76.6 |
Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution |  | 51,577.9 |  |  | 51,214.7 |  |  | 51,683.5 |
PER UNRESTRICTED SHARE IN WHOLE DOLLARS |  |  |  |  |  |
Basic Income from Continuing Operations Per Unrestricted Share |  | $ | 2.32 |  |  | $ | 0.25 |  |  | $ | 1.55 |
Diluted Income from Continuing Operations Per Unrestricted Share |  | $ | 2.31 |  |  | $ | 0.25 |  |  | $ | 1.55 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
SHARES IN THOUSANDS |  | 2017 |  | 2016 |  | 2015
Equity-based Compensation Equivalent Shares |  | 346.6 |  |  | 959.9 |  |  | 959.7 |
Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution |  | 346.6 |  |  | 959.9 |  |  | 959.7 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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