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Earnings per Share (Tables) (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | Basic earnings per share are based upon the weighted-average number of shares of common stock outstanding. Diluted earnings per share are based upon the weighted-average number of shares of common stock outstanding, plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. Our potentially dilutive securities consist of restricted stock, restricted stock units, performance share awards and SSARs.
| Quarter Ended |  | Nine Months Ended
Share amounts in millions | September 30, |  | September 30,
2018 |  | 2017 |  | 2018 |  | 2017
Denominator for basic earnings per share: |  |  |  |  |  |  |
Weighted average common shares outstanding - basic | 142.5 |  |  | 144.5 |  |  | 143.9 |  |  | 144.4 |
Effect of dilutive securities: |  |  |  |  |  |  |
Dilutive effect of employee stock plans | 1.4 |  |  | 2.0 |  |  | 1.7 |  |  | 1.9 |
Denominator for diluted earnings per share: |  |  |  |  |  |  |
Weighted average shares outstanding - diluted | 143.9 |  |  | 146.5 |  |  | 145.6 |  |  | 146.3 |

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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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