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Per Share Information | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Per Share Information | Per Share Information The following table sets forth the computation of basic and diluted loss per common share:
| Three months ended |  | Nine months ended
(In millions, except per share amounts) | September 30, |  | September 30,
2016 |  | 2015 |  | 2016 |  | 2015
Numerator: |  |  |  |  |  |  |
Numerator for basic loss per common share – |  |  |  |  |  |  |
Loss attributable to ATI | $ | (530.8 | ) |  | $ | (144.6 | ) |  | $ | (650.8 | ) |  | $ | (151.0 | )
Redeemable noncontrolling interest (Note 11) | — |  |  | (0.2 | ) |  | — |  |  | (0.3 | )
Effect of dilutive securities: |  |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | — |  |  | — |  |  | — |  |  | — |
Numerator for diluted loss per common share – |  |  |  |  |  |  |
Loss attributable to ATI after assumed conversions | $ | (530.8 | ) |  | $ | (144.8 | ) |  | $ | (650.8 | ) |  | $ | (151.3 | )
Denominator: |  |  |  |  |  |  |
Denominator for basic net loss per common share – weighted average shares | 107.3 |  |  | 107.3 |  |  | 107.3 |  |  | 107.3 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | — |  |  | — |  |  | — |  |  | — |
4.75% Convertible Senior Notes due 2022 | — |  |  | — |  |  | — |  |  | — |
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions | 107.3 |  |  | 107.3 |  |  | 107.3 |  |  | 107.3 |
Basic loss attributable to ATI per common share | $ | (4.95 | ) |  | $ | (1.35 | ) |  | $ | (6.07 | ) |  | $ | (1.41 | )
Diluted loss attributable to ATI per common share | $ | (4.95 | ) |  | $ | (1.35 | ) |  | $ | (6.07 | ) |  | $ | (1.41 | )
Common stock that would be issuable upon the assumed conversion of the 2022 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. There were 21.0 million and 10.3 million anti-dilutive shares for the three and nine month periods ended September 30, 2016, respectively. There were 0.8 million and 0.9 million anti-dilutive shares for the three and nine month periods ended September 30, 2015, respectively.

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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 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: 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 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=64863997&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=65016374&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=63488584&loc=d3e20235-122688 + Details
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