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Per Share Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule earnings per share | The following table sets forth the computation of basic and diluted net income (loss) per common share: (In millions, except per share amounts)
For the Years Ended December 31, |  | 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |
Numerator for basic net income (loss) per common share - |  |  |  |  |  |
Net income (loss) attributable to ATI |  | $ | 222.4 |  |  | $ | (91.9 | ) |  | $ | (640.9 | )
Effect of dilutive securities: |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 |  | 12.9 |  |  | — |  |  | — |
Numerator for diluted net income (loss) per common share - |  |  |  |  |  |
Net income (loss) attributable to ATI after assumed conversions |  | $ | 235.3 |  |  | $ | (91.9 | ) |  | $ | (640.9 | )
Denominator: |  |  |  |  |  |
Denominator for basic net income (loss) per common share—weighted average shares |  | 125.2 |  |  | 110.1 |  |  | 107.3 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation |  | 0.8 |  |  | — |  |  | — |
4.75% Convertible Senior Notes due 2022 |  | 19.9 |  |  | — |  |  | — |
Denominator for diluted net income (loss) per common share—adjusted weighted average shares and assumed conversions |  | 145.9 |  |  | 110.1 |  |  | 107.3 |
Basic net income (loss) attributable to ATI per common share |  | $ | 1.78 |  |  | $ | (0.83 | ) |  | $ | (5.97 | )
Diluted net income (loss) attributable to ATI per common share |  | $ | 1.61 |  |  | $ | (0.83 | ) |  | $ | (5.97 | )

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