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Per Share Information (Tables) | 3 Months Ended
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Mar. 31, 2018
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 per common share:
|  | Three months ended
(In millions, except per share amounts) |  | March 31,
| 2018 |  | 2017
Numerator: |  |  |  |
Numerator for basic income per common share – |  |  |  |
Net income attributable to ATI |  | $ | 58.0 |  |  | $ | 17.5 |
Effect of dilutive securities: |  |  |  |
4.75% Convertible Senior Notes due 2022 |  | 3.2 |  |  | 3.0 |
Numerator for diluted income per common share – |  |  |  |
Net income attributable to ATI after assumed conversions |  | $ | 61.2 |  |  | $ | 20.5 |
Denominator: |  |  |  |
Denominator for basic net income per common share – weighted average shares |  | 125.0 |  |  | 107.5 |
Effect of dilutive securities: |  |  |  |
Share-based compensation |  | 0.6 |  |  | 0.8 |
4.75% Convertible Senior Notes due 2022 |  | 19.9 |  |  | 19.9 |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions |  | 145.5 |  |  | 128.2 |
Basic net income attributable to ATI per common share |  | $ | 0.46 |  |  | $ | 0.16 |
Diluted net income attributable to ATI per common share |  | $ | 0.42 |  |  | $ | 0.16 |

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