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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of basic and diluted earnings per share:
| Year ended December 31,
Share amounts in millions | 2018 |  | 2017 |  | 2016
Denominator for basic earnings per share: |  |  |  |  |
Weighted average common shares outstanding | 143.0 |  |  | 144.4 |  |  | 143.4 |
Effect of dilutive securities: |  |  |  |  |
Dilutive effect of employee stock plans | 1.4 |  |  | 2.0 |  |  | 1.7 |
Dilutive effect of stock warrants | — |  |  | — |  |  | 0.2 |
Dilutive potential common shares | 1.4 |  |  | 2.0 |  |  | 1.9 |
Denominator for diluted earnings per share: |  |  |  |  |
Adjusted weighted average shares | 144.4 |  |  | 146.4 |  |  | 145.3 |

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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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