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Per Share Information | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share Disclosures [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 |  | Nine months ended
(in millions, except per share amounts): | September 30, |  | September 30,
2013 |  | 2012 |  | 2013 |  | 2012
Numerator for basic income (loss) from continuing operations per common share - |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to ATI | $ | (28.4 | ) |  | $ | 31.3 |  |  | $ | (15.0 | ) |  | $ | 134.5 |
Effect of dilutive securities: |  |  |  |  |  |  |
4.25% Convertible Notes due 2014 | — |  |  | 2.1 |  |  | — |  |  | 6.5 |
Numerator for diluted income (loss) from continuing operations per common share - |  |  |  |  |  |  |
Income (loss) from continuing operations available to ATI after assumed conversions | $ | (28.4 | ) |  | $ | 33.4 |  |  | $ | (15.0 | ) |  | $ | 141.0 |
Denominator for basic net income per common share-weighted average shares | 106.8 |  |  | 106.2 |  |  | 106.7 |  |  | 106.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | — |  |  | 0.9 |  |  | — |  |  | 0.9 |
4.25% Convertible Notes due 2014 | — |  |  | 9.6 |  |  | — |  |  | 9.6 |
Denominator for diluted net income per common share – adjusted weighted average shares assuming conversions | 106.8 |  |  | 116.7 |  |  | 106.7 |  |  | 116.6 |
Basic income (loss) from continuing operations attributable to ATI per common share | $ | (0.27 | ) |  | $ | 0.30 |  |  | $ | (0.14 | ) |  | $ | 1.27 |
Diluted income (loss) from continuing operations attributable to ATI per common share | $ | (0.27 | ) |  | $ | 0.29 |  |  | $ | (0.14 | ) |  | $ | 1.21 |
Common stock that would be issuable upon the assumed conversion of the 2014 Convertible Notes 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. Excluded shares for the three and nine month periods ended September 30, 2013 were 10.0 million shares. There were no anti-dilutive shares for the periods ended September 30, 2012.

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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 Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6880815&loc=d3e20235-122688 Reference 4: 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 5: 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=16381557&loc=d3e4984-109258 Reference 6: 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 + Details
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