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Per Share Information | 9 Months Ended
--- | ---
Sep. 30, 2015
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 |  | Nine months ended
(In millions, except per share amounts) | September 30, |  | September 30,
2015 |  | 2014 |  | 2015 |  | 2014
Numerator for basic loss from continuing operations per common share – |  |  |  |  |  |  |
Loss from continuing operations attributable to ATI | $ | (144.6 | ) |  | $ | — |  |  | $ | (151.0 | ) |  | $ | (21.9 | )
Redeemable noncontrolling interest (Note 10) | (0.2 | ) |  | — |  |  | (0.3 | ) |  | — |
Numerator for diluted loss from continuing operations per common share – |  |  |  |  |  |  |
Loss from continuing operations available to ATI after assumed conversions | $ | (144.8 | ) |  | $ | — |  |  | $ | (151.3 | ) |  | $ | (21.9 | )
Denominator for basic net loss per common share – weighted average shares | 107.3 |  |  | 107.2 |  |  | 107.3 |  |  | 107.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | — |  |  | 0.8 |  |  | — |  |  | — |
4.25% Convertible Notes due 2014 | — |  |  | — |  |  | — |  |  | — |
Denominator for diluted net loss per common share – adjusted weighted average shares assuming conversions | 107.3 |  |  | 108.0 |  |  | 107.3 |  |  | 107.1 |
Basic loss from continuing operations attributable to ATI per common share | $ | (1.35 | ) |  | $ | — |  |  | $ | (1.41 | ) |  | $ | (0.20 | )
Diluted loss from continuing operations attributable to ATI per common share | $ | (1.35 | ) |  | $ | — |  |  | $ | (1.41 | ) |  | $ | (0.20 | )
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 0.8 million and 0.9 million anti-dilutive shares for the three and nine month periods ended September 30, 2015, respectively, and 6.0 million anti-dilutive shares for the nine month period ended September 30, 2014. There were no anti-dilutive shares for three months ended September 30, 2014.

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