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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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,
Dollar and share amounts in millions, except per share amounts | 2015 |  | 2014 |  | 2013
Numerator: |  |  |  |  |
Net income (loss): |  |  |  |  |
Income (loss) from continuing operations | $ | (86.0 | ) |  | $ | (73.4 | ) |  | $ | 177.4 |
Loss from discontinued operations | (2.1 | ) |  | (2.0 | ) |  | (0.3 | )
Net income (loss) | $ | (88.1 | ) |  | $ | (75.4 | ) |  | $ | 177.1 |
Denominator: |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |
Weighted average common shares outstanding | 142.4 |  |  | 141.1 |  |  | 139.6 |
Effect of dilutive securities: |  |  |  |  |
Dilutive effect of employee stock plans | — |  |  | — |  |  | 2.5 |
Dilutive effect of stock warrants | — |  |  | — |  |  | 2.2 |
Dilutive potential common shares | — |  |  | — |  |  | 4.7 |
Denominator for diluted earnings per share: |  |  |  |  |
Adjusted weighted average shares | 142.4 |  |  | 141.1 |  |  | 144.3 |
Basic earnings per share: |  |  |  |  |
Income (loss) from continuing operations | $ | (0.60 | ) |  | $ | (0.52 | ) |  | $ | 1.27 |
Loss from discontinued operations | (0.02 | ) |  | (0.01 | ) |  | — |
Net income (loss) per share | $ | (0.62 | ) |  | $ | (0.53 | ) |  | $ | 1.27 |
Diluted earnings per share: |  |  |  |  |
Income (loss) from continuing operations | $ | (0.60 | ) |  | $ | (0.52 | ) |  | $ | 1.23 |
Loss from discontinued operations | (0.02 | ) |  | (0.01 | ) |  | — |
Net income (loss) per share | $ | (0.62 | ) |  | $ | (0.53 | ) |  | $ | 1.23 |

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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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