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Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 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 |  | Nine months ended
(In millions, except per share amounts) | September 30, |  | September 30,
2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Numerator for basic income per common share – |  |  |  |  |  |  |
Net income attributable to ATI | $ | 111.0 |  |  | $ | 50.5 |  |  | $ | 201.1 |  |  | $ | 181.3 |
Effect of dilutive securities: |  |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | 3.2 |  |  | 3.2 |  |  | 9.7 |  |  | 9.6 |
Numerator for diluted income per common share – |  |  |  |  |  |  |
Net income attributable to ATI after assumed conversions | $ | 114.2 |  |  | $ | 53.7 |  |  | $ | 210.8 |  |  | $ | 190.9 |
Denominator: |  |  |  |  |  |  |
Denominator for basic net income per common share – weighted average shares | 125.9 |  |  | 125.2 |  |  | 125.7 |  |  | 125.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | 0.9 |  |  | 0.9 |  |  | 0.8 |  |  | 0.7 |
4.75% Convertible Senior Notes due 2022 | 19.9 |  |  | 19.9 |  |  | 19.9 |  |  | 19.9 |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 146.7 |  |  | 146.0 |  |  | 146.4 |  |  | 145.7 |
Basic net income attributable to ATI per common share | $ | 0.88 |  |  | $ | 0.40 |  |  | $ | 1.60 |  |  | $ | 1.45 |
Diluted net income attributable to ATI per common share | $ | 0.78 |  |  | $ | 0.37 |  |  | $ | 1.44 |  |  | $ | 1.31 |

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