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Per Share Information | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Per Share Information | Per Share Information The following table sets forth the computation of basic and diluted income (loss) per common share:
| Three months ended |  | Nine months ended
(In millions, except per share amounts) | September 30, |  | September 30,
2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Numerator for basic income (loss) per common share – |  |  |  |  |  |  |
Net income (loss) attributable to ATI | $ | 50.5 |  |  | $ | (121.2 | ) |  | $ | 181.3 |  |  | $ | (93.6 | )
Effect of dilutive securities: |  |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | 3.2 |  |  | — |  |  | 9.6 |  |  | — |
Numerator for diluted income (loss) per common share – |  |  |  |  |  |  |
Net income (loss) attributable to ATI after assumed conversions | $ | 53.7 |  |  | $ | (121.2 | ) |  | $ | 190.9 |  |  | $ | (93.6 | )
Denominator: |  |  |  |  |  |  |
Denominator for basic net income (loss) per common share – weighted average shares | 125.2 |  |  | 107.7 |  |  | 125.1 |  |  | 107.7 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | 0.9 |  |  | — |  |  | 0.7 |  |  | — |
4.75% Convertible Senior Notes due 2022 | 19.9 |  |  | — |  |  | 19.9 |  |  | — |
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions | 146.0 |  |  | 107.7 |  |  | 145.7 |  |  | 107.7 |
Basic net income (loss) attributable to ATI per common share | $ | 0.40 |  |  | $ | (1.12 | ) |  | $ | 1.45 |  |  | $ | (0.87 | )
Diluted net income (loss) attributable to ATI per common share | $ | 0.37 |  |  | $ | (1.12 | ) |  | $ | 1.31 |  |  | $ | (0.87 | )
Common stock that would be issuable upon the assumed conversion of the 4.75% Convertible Senior Notes due 2022 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 no anti-dilutive shares for the three and nine month periods ended September 30, 2018. There were 20.9 million and 20.7 million anti-dilutive shares for the three and nine month periods ended September 30, 2017, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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