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Per Share Information (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Schedule earnings per share | The following table sets forth the computation of basic and diluted income from continuing operations per common share: (in millions, except per share amounts)
Years ended December 31, |  | 2013 |  | 2012 |  | 2011
Numerator: |  |  |  |  |  |
Numerator for basic income (loss) from continuing operations per common share - |  |  |  |  |  |
Income (loss) from continuing operations attributable to ATI |  | $ | (98.8 | ) |  | $ | 150.5 |  |  | $ | 202.9 |
Effect of dilutive securities: |  |  |  |  |  |
4.25% Convertible Senior Notes due 2014 |  | — |  |  | 8.5 |  |  | 9.9 |
Numerator for diluted net income (loss) per common share - |  |  |  |  |  |
Income (loss) from continuing operations attributable to ATI after assumed conversions |  | $ | (98.8 | ) |  | $ | 159.0 |  |  | $ | 212.8 |
Denominator: |  |  |  |  |  |
Denominator for basic net income per common share—weighted average shares |  | 106.8 |  |  | 106.1 |  |  | 102.5 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation |  | — |  |  | 0.9 |  |  | 1.8 |
4.25% Convertible Senior Notes due 2014 |  | — |  |  | 9.6 |  |  | 9.6 |
Denominator for diluted net income per common share—adjusted weighted average shares and assumed conversions |  | 106.8 |  |  | 116.6 |  |  | 113.9 |
Basic income (loss) from continuing operations attributable to ATI per common share |  | $ | (0.93 | ) |  | $ | 1.42 |  |  | $ | 1.98 |
Diluted income (loss) from continuing operations attributable to ATI per common share |  | $ | (0.93 | ) |  | $ | 1.36 |  |  | $ | 1.87 |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Reference 7: 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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