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Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 2015
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 from continuing operations per common share:
| Three months ended |  | Nine months ended
(In millions, except per share amounts) | September 30, |  | September 30,
2015 |  | 2014 |  | 2015 |  | 2014
Numerator for basic loss from continuing operations per common share – |  |  |  |  |  |  |
Loss from continuing operations attributable to ATI | $ | (144.6 | ) |  | $ | — |  |  | $ | (151.0 | ) |  | $ | (21.9 | )
Redeemable noncontrolling interest (Note 10) | (0.2 | ) |  | — |  |  | (0.3 | ) |  | — |
Numerator for diluted loss from continuing operations per common share – |  |  |  |  |  |  |
Loss from continuing operations available to ATI after assumed conversions | $ | (144.8 | ) |  | $ | — |  |  | $ | (151.3 | ) |  | $ | (21.9 | )
Denominator for basic net loss per common share – weighted average shares | 107.3 |  |  | 107.2 |  |  | 107.3 |  |  | 107.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | — |  |  | 0.8 |  |  | — |  |  | — |
4.25% Convertible Notes due 2014 | — |  |  | — |  |  | — |  |  | — |
Denominator for diluted net loss per common share – adjusted weighted average shares assuming conversions | 107.3 |  |  | 108.0 |  |  | 107.3 |  |  | 107.1 |
Basic loss from continuing operations attributable to ATI per common share | $ | (1.35 | ) |  | $ | — |  |  | $ | (1.41 | ) |  | $ | (0.20 | )
Diluted loss from continuing operations attributable to ATI per common share | $ | (1.35 | ) |  | $ | — |  |  | $ | (1.41 | ) |  | $ | (0.20 | )

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