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Per Share Information (Tables) | 6 Months Ended
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Jun. 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 |  | Six months ended
(In millions, except per share amounts) | June 30, |  | June 30,
2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Numerator for basic income per common share – |  |  |  |  |  |  |
Net income attributable to ATI | $ | 75.1 |  |  | $ | 72.8 |  |  | $ | 90.1 |  |  | $ | 130.8 |
Effect of dilutive securities: |  |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | 3.2 |  |  | 3.2 |  |  | 6.5 |  |  | 6.4 |
Numerator for diluted income per common share – |  |  |  |  |  |  |
Net income attributable to ATI after assumed conversions | $ | 78.3 |  |  | $ | 76.0 |  |  | $ | 96.6 |  |  | $ | 137.2 |
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 | 0.6 |  |  | 0.7 |  |  | 0.6 |  |  | 0.6 |
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 | 146.4 |  |  | 145.8 |  |  | 146.2 |  |  | 145.6 |
Basic net income attributable to ATI per common share | $ | 0.60 |  |  | $ | 0.58 |  |  | $ | 0.72 |  |  | $ | 1.05 |
Diluted net income attributable to ATI per common share | $ | 0.54 |  |  | $ | 0.52 |  |  | $ | 0.66 |  |  | $ | 0.94 |

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