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, | 2017 | | 2016 | | 2017 | | 2016 | Numerator: | | | | | | | | Numerator for basic loss per common share – | | | | | | | | Net loss attributable to ATI | $ | (121.2 | ) | | $ | (530.8 | ) | | $ | (93.6 | ) | | $ | (650.8 | ) | Effect of dilutive securities: | | | | | | | | 4.75% Convertible Senior Notes due 2022 | — |
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| Numerator for diluted loss per common share – | | | | | | | | Net loss attributable to ATI after assumed conversions | $ | (121.2 | ) | | $ | (530.8 | ) | | $ | (93.6 | ) | | $ | (650.8 | ) | Denominator: | | | | | | | | Denominator for basic net loss per common share – weighted average shares | 107.7 |
| | 107.3 |
| | 107.7 |
| | 107.3 |
| Effect of dilutive securities: | | | | | | | | Share-based compensation | — |
| | — |
| | — |
| | — |
| 4.75% Convertible Senior Notes due 2022 | — |
| | — |
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| Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions | 107.7 |
| | 107.3 |
| | 107.7 |
| | 107.3 |
| Basic net loss attributable to ATI per common share | $ | (1.12 | ) | | $ | (4.95 | ) | | $ | (0.87 | ) | | $ | (6.07 | ) | Diluted net loss attributable to ATI per common share | $ | (1.12 | ) | | $ | (4.95 | ) | | $ | (0.87 | ) | | $ | (6.07 | ) |
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 20.9 million and 20.7 million anti-dilutive shares for the three and nine month periods ended September 30, 2017. There were 21.0 million and 10.3 million anti-dilutive shares for the three and nine month periods ended September 30, 2016, respectively. |