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Per Share Information (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  | Six months ended
(In millions, except per share amounts) | June 30, |  | June 30,
2017 |  | 2016 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |
Numerator for basic income (loss) per common share – |  |  |  |  |  |  |
Net income (loss) attributable to ATI | $ | 10.1 |  |  | $ | (18.8 | ) |  | $ | 27.6 |  |  | $ | (120.0 | )
Effect of dilutive securities: |  |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | 1.8 |  |  | — |  |  | 4.8 |  |  | — |
Numerator for diluted income (loss) per common share – |  |  |  |  |  |  |
Net income (loss) attributable to ATI after assumed conversions | $ | 11.9 |  |  | $ | (18.8 | ) |  | $ | 32.4 |  |  | $ | (120.0 | )
Denominator: |  |  |  |  |  |  |
Denominator for basic net income (loss) per common share – weighted average shares | 107.7 |  |  | 107.3 |  |  | 107.6 |  |  | 107.3 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | 0.7 |  |  | — |  |  | 0.8 |  |  | — |
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 | 128.3 |  |  | 107.3 |  |  | 128.3 |  |  | 107.3 |
Basic net income (loss) attributable to ATI per common share | $ | 0.09 |  |  | $ | (0.18 | ) |  | $ | 0.26 |  |  | $ | (1.12 | )
Diluted net income (loss) attributable to ATI per common share | $ | 0.09 |  |  | $ | (0.18 | ) |  | $ | 0.25 |  |  | $ | (1.12 | )

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