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Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Diluted By Common Class | The following table sets forth the computation of basic and diluted loss per common share:
| Three months ended |  | Nine months ended
(In millions, except per share amounts) | September 30, |  | September 30,
2016 |  | 2015 |  | 2016 |  | 2015
Numerator: |  |  |  |  |  |  |
Numerator for basic loss per common share – |  |  |  |  |  |  |
Loss attributable to ATI | $ | (530.8 | ) |  | $ | (144.6 | ) |  | $ | (650.8 | ) |  | $ | (151.0 | )
Redeemable noncontrolling interest (Note 11) | — |  |  | (0.2 | ) |  | — |  |  | (0.3 | )
Effect of dilutive securities: |  |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | — |  |  | — |  |  | — |  |  | — |
Numerator for diluted loss per common share – |  |  |  |  |  |  |
Loss attributable to ATI after assumed conversions | $ | (530.8 | ) |  | $ | (144.8 | ) |  | $ | (650.8 | ) |  | $ | (151.3 | )
Denominator: |  |  |  |  |  |  |
Denominator for basic net loss per common share – weighted average shares | 107.3 |  |  | 107.3 |  |  | 107.3 |  |  | 107.3 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | — |  |  | — |  |  | — |  |  | — |
4.75% Convertible Senior Notes due 2022 | — |  |  | — |  |  | — |  |  | — |
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions | 107.3 |  |  | 107.3 |  |  | 107.3 |  |  | 107.3 |
Basic loss attributable to ATI per common share | $ | (4.95 | ) |  | $ | (1.35 | ) |  | $ | (6.07 | ) |  | $ | (1.41 | )
Diluted loss attributable to ATI per common share | $ | (4.95 | ) |  | $ | (1.35 | ) |  | $ | (6.07 | ) |  | $ | (1.41 | )

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