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Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 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 (loss) per common share:
| Three months ended |  | Nine months ended
(In millions, except per share amounts) | September 30, |  | September 30,
2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |
Numerator for basic income (loss) per common share – |  |  |  |  |  |  |
Net income (loss) attributable to ATI | $ | (50.1) |  |  | $ | 111.0 |  |  | $ | (451.6) |  |  | $ | 201.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | — |  |  | 3.2 |  |  | — |  |  | 9.7 |
3.5% Convertible Senior Notes due 2025 | — |  |  | — |  |  | — |  |  | — |
Numerator for diluted income (loss) per common share – |  |  |  |  |  |  |
Net income (loss) attributable to ATI after assumed conversions | $ | (50.1) |  |  | $ | 114.2 |  |  | $ | (451.6) |  |  | $ | 210.8 |
Denominator: |  |  |  |  |  |  |
Denominator for basic net income (loss) per common share – weighted average shares | 126.6 |  |  | 125.9 |  |  | 126.5 |  |  | 125.7 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | — |  |  | 0.9 |  |  | — |  |  | 0.8 |
4.75% Convertible Senior Notes due 2022 | — |  |  | 19.9 |  |  | — |  |  | 19.9 |
3.5% Convertible Senior Notes due 2025 | — |  |  | — |  |  | — |  |  | — |
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions | 126.6 |  |  | 146.7 |  |  | 126.5 |  |  | 146.4 |
Basic net income (loss) attributable to ATI per common share | $ | (0.40) |  |  | $ | 0.88 |  |  | $ | (3.57) |  |  | $ | 1.60 |
Diluted net income (loss) attributable to ATI per common share | $ | (0.40) |  |  | $ | 0.78 |  |  | $ | (3.57) |  |  | $ | 1.44 |

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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258 + Details
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