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Per Share Information (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Schedule earnings per share | The following table sets forth the computation of basic and diluted loss from continuing operations per common share: (In millions, except per share amounts)
For the Years Ended December 31, |  | 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |
Numerator for basic loss from continuing operations per common share - |  |  |  |  |  |
Loss from continuing operations attributable to ATI |  | $ | (640.9 | ) |  | $ | (377.9 | ) |  | $ | (2.0 | )
Redeemable noncontrolling interest (Note 18) |  | — |  |  | (0.3 | ) |  | (0.3 | )
Effect of dilutive securities: |  |  |  |  |  |
Convertible Senior Notes (a) |  | — |  |  | — |  |  | — |
Numerator for diluted net loss per common share - |  |  |  |  |  |
Loss from continuing operations attributable to ATI after assumed conversions |  | $ | (640.9 | ) |  | $ | (378.2 | ) |  | $ | (2.3 | )
Denominator: |  |  |  |  |  |
Denominator for basic net loss per common share—weighted average shares |  | 107.3 |  |  | 107.3 |  |  | 107.1 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation |  | — |  |  | — |  |  | — |
Convertible Senior Notes (a) |  | — |  |  | — |  |  | — |
Denominator for diluted net loss per common share—adjusted weighted average shares and assumed conversions |  | 107.3 |  |  | 107.3 |  |  | 107.1 |
Basic loss from continuing operations attributable to ATI per common share |  | $ | (5.97 | ) |  | $ | (3.53 | ) |  | $ | (0.02 | )
Diluted loss from continuing operations attributable to ATI per common share |  | $ | (5.97 | ) |  | $ | (3.53 | ) |  | $ | (0.02 | )

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