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Per Share Information (Tables) | 3 Months Ended
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Mar. 31, 2014
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Diluted By Common Class | The following table sets forth the computation of basic and diluted income from continuing operations per common share:
| Three Months Ended
(in millions, except per share amounts): | March 31,
2014 |  | 2013
Numerator for basic income (loss) from continuing operations per common share – |  |  |
Income (loss) from continuing operations attributable to ATI | $ | (18.1 | ) |  | $ | 9.7 |
Effect of dilutive securities: |  |  |
4.25% Convertible Notes due 2014 | — |  |  | — |
Numerator for diluted income (loss) from continuing operations per common share – |  |  |
Income (loss) from continuing operations available to ATI after assumed conversions | $ | (18.1 | ) |  | $ | 9.7 |
Denominator for basic net income per common share-weighted average shares | 107.0 |  |  | 106.6 |
Effect of dilutive securities: |  |  |
Share-based compensation | — |  |  | 0.5 |
4.25% Convertible Notes due 2014 | — |  |  | — |
Denominator for diluted net income per common share – adjusted weighted average shares assuming conversions | 107.0 |  |  | 107.1 |
Basic income (loss) from continuing operations attributable to ATI per common share | $ | (0.17 | ) |  | $ | 0.09 |
Diluted income (loss) from continuing operations attributable to ATI per common share | $ | (0.17 | ) |  | $ | 0.09 |

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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1311-109256 + Details
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