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Per Share Information | 6 Months Ended
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Jun. 30, 2014
Earnings Per Share [Abstract] |
Per Share Information | Per Share Information The following table sets forth the computation of basic and diluted income from continuing operations per common share:
| Three Months Ended |  | Six months ended
(in millions, except per share amounts): | June 30, |  | June 30,
2014 |  | 2013 |  | 2014 |  | 2013
Numerator for basic income (loss) from continuing operations per common share – |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to ATI | $ | (3.8 | ) |  | $ | 3.7 |  |  | $ | (21.9 | ) |  | $ | 13.4 |
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 | $ | (3.8 | ) |  | $ | 3.7 |  |  | $ | (21.9 | ) |  | $ | 13.4 |
Denominator for basic net income per common share-weighted average shares | 107.1 |  |  | 106.8 |  |  | 107.0 |  |  | 106.7 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | — |  |  | 0.4 |  |  | — |  |  | 0.4 |
4.25% Convertible Notes due 2014 | — |  |  | — |  |  | — |  |  | — |
Denominator for diluted net income per common share – adjusted weighted average shares assuming conversions | 107.1 |  |  | 107.2 |  |  | 107.0 |  |  | 107.1 |
Basic income (loss) from continuing operations attributable to ATI per common share | $ | (0.03 | ) |  | $ | 0.04 |  |  | $ | (0.20 | ) |  | $ | 0.13 |
Diluted income (loss) from continuing operations attributable to ATI per common share | $ | (0.03 | ) |  | $ | 0.04 |  |  | $ | (0.20 | ) |  | $ | 0.13 |
Common stock that would be issuable upon the assumed conversion of the 2014 Convertible Notes (prior to maturity on June 2, 2014) and other option equivalents and contingently issuable shares are excluded from the computation of contingently issuable shares, and therefore, from the denominator for diluted earnings per share, if the effect of inclusion is anti-dilutive. There were 7.0 million and 8.5 million anti-dilutive shares for the three and six month periods ended June 30, 2014, respectively, and 9.6 million anti-dilutive shares for the three and six month periods ended June 30, 2013.

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- Definition The entire disclosure for 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 + Details
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