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Per Share Information (Tables) | 3 Months Ended
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Mar. 31, 2020
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,
2020 |  | 2019
Numerator: |  |  |
Numerator for basic income per common share – |  |  |
Net income attributable to ATI | $ | 21.1 |  |  | $ | 15.0 |
Effect of dilutive securities: |  |  |
4.75% Convertible Senior Notes due 2022 | 2.3 |  |  | — |
Numerator for diluted income per common share – |  |  |
Net income attributable to ATI after assumed conversions | $ | 23.4 |  |  | $ | 15.0 |
Denominator: |  |  |
Denominator for basic net income per common share – weighted average shares | 126.1 |  |  | 125.4 |
Effect of dilutive securities: |  |  |
Share-based compensation | 0.4 |  |  | 0.7 |
4.75% Convertible Senior Notes due 2022 | 19.9 |  |  | — |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 146.4 |  |  | 126.1 |
Basic net income attributable to ATI per common share | $ | 0.17 |  |  | $ | 0.12 |
Diluted net income attributable to ATI per common share | $ | 0.16 |  |  | $ | 0.12 |

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