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Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Diluted By Common Class | 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 | )

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