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Per Share Information (Tables) | 3 Months Ended
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Mar. 31, 2019
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,
2019 |  | 2018
Numerator: |  |  |
Numerator for basic income per common share – |  |  |
Net income attributable to ATI | $ | 15.0 |  |  | $ | 58.0 |
Effect of dilutive securities: |  |  |
4.75% Convertible Senior Notes due 2022 | — |  |  | 3.2 |
Numerator for diluted income per common share – |  |  |
Net income attributable to ATI after assumed conversions | $ | 15.0 |  |  | $ | 61.2 |
Denominator: |  |  |
Denominator for basic net income per common share – weighted average shares | 125.4 |  |  | 125.0 |
Effect of dilutive securities: |  |  |
Share-based compensation | 0.7 |  |  | 0.6 |
4.75% Convertible Senior Notes due 2022 | — |  |  | 19.9 |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 126.1 |  |  | 145.5 |
Basic net income attributable to ATI per common share | $ | 0.12 |  |  | $ | 0.46 |
Diluted net income attributable to ATI per common share | $ | 0.12 |  |  | $ | 0.42 |

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