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Per Share Information (Tables) | 3 Months Ended
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Mar. 31, 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 income (loss) per common share:
| Three months ended
(In millions, except per share amounts) | March 31,
2016 |  | 2015
Numerator for basic income (loss) per common share – |  |  |
Income (loss) attributable to ATI | $ | (101.2 | ) |  | $ | 10.0 |
Redeemable noncontrolling interest (Note 10) | — |  |  | (0.1 | )
Numerator for diluted income (loss) per common share – |  |  |
Income (loss) available to ATI after assumed conversions | $ | (101.2 | ) |  | $ | 9.9 |
Denominator for basic net income (loss) per common share – weighted average shares | 107.3 |  |  | 107.2 |
Effect of dilutive securities: |  |  |
Share-based compensation | — |  |  | 0.8 |
Denominator for diluted net income (loss) per common share – adjusted weighted average shares assuming conversions | 107.3 |  |  | 108.0 |
Basic income (loss) attributable to ATI per common share | $ | (0.94 | ) |  | $ | 0.09 |
Diluted income (loss) attributable to ATI per common share | $ | (0.94 | ) |  | $ | 0.09 |

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