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Per Share Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule earnings per share | The following table sets forth the computation of basic and diluted net income (loss) per common share: (In millions, except per share amounts)
For the Years Ended December 31, |  | 2021 |  | 2020* |  | 2019*
Numerator: |  |  |  |  |  |
Numerator for basic net income (loss) per common share - |  |  |  |  |  |
Net income (loss) attributable to ATI |  | $ | (38.2) |  |  | $ | (1,572.6) |  |  | $ | 252.5 |
Effect of dilutive securities: |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 |  | — |  |  | — |  |  | 12.8 |
3.5% Convertible Senior Notes due 2025 |  | — |  |  | — |  |  | — |
Numerator for diluted net income (loss) per common share - |  |  |  |  |  |
Net income (loss) attributable to ATI after assumed conversions |  | $ | (38.2) |  |  | $ | (1,572.6) |  |  | $ | 265.3 |
Denominator: |  |  |  |  |  |
Denominator for basic net income (loss) per common share—weighted average shares |  | 127.1 |  |  | 126.5 |  |  | 125.8 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation |  | — |  |  | — |  |  | 0.8 |
4.75% Convertible Senior Notes due 2022 |  | — |  |  | — |  |  | 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 |  | 127.1 |  |  | 126.5 |  |  | 146.5 |
Basic net income (loss) attributable to ATI per common share |  | $ | (0.30) |  |  | $ | (12.43) |  |  | $ | 2.01 |
Diluted net income (loss) attributable to ATI per common share |  | $ | (0.30) |  |  | $ | (12.43) |  |  | $ | 1.81 |
*Years ended December 31, 2020 and 2019 reflect the change in inventory accounting method, as described in Note 1 of the Notes to the Consolidated Financial Statements. There were no adjustments to 2020 amounts as a result of this change.

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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=125511455&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=124432515&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=125512782&loc=d3e4984-109258 + Details
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