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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information |
|  | Quarter Ended
(In millions, except per share amounts) |  | March 31 |  | June 30 |  | September 30 |  | December 31
2019 - |  |  |  |  |  |  |  |
Sales |  | $ | 1,004.8 |  |  | $ | 1,080.4 |  |  | $ | 1,018.7 |  |  | $ | 1,018.6 |
Gross Profit |  | 131.1 |  |  | 177.7 |  |  | 159.7 |  |  | 169.3 |
Net income |  | 16.3 |  |  | 78.5 |  |  | 115.3 |  |  | 60.0 |
Net income attributable to ATI |  | 15.0 |  |  | 75.1 |  |  | 111.0 |  |  | 56.5 |
Basic income attributable to ATI per common share |  | $ | 0.12 |  |  | $ | 0.60 |  |  | $ | 0.88 |  |  | $ | 0.45 |
Diluted income attributable to ATI per common share |  | $ | 0.12 |  |  | $ | 0.54 |  |  | $ | 0.78 |  |  | $ | 0.41 |
Average shares outstanding |  | 125.8 |  |  | 126.1 |  |  | 126.1 |  |  | 126.1 |
2018 - |  |  |  |  |  |  |  |
Sales |  | $ | 979.0 |  |  | $ | 1,009.5 |  |  | $ | 1,020.2 |  |  | $ | 1,037.9 |
Gross Profit |  | 148.6 |  |  | 173.7 |  |  | 160.4 |  |  | 147.6 |
Net income |  | 60.5 |  |  | 75.6 |  |  | 55.6 |  |  | 45.0 |
Net income attributable to ATI |  | 58.0 |  |  | 72.8 |  |  | 50.5 |  |  | 41.1 |
Basic income attributable to ATI per common share |  | $ | 0.46 |  |  | $ | 0.58 |  |  | $ | 0.40 |  |  | $ | 0.33 |
Diluted income attributable to ATI per common share |  | $ | 0.42 |  |  | $ | 0.52 |  |  | $ | 0.37 |  |  | $ | 0.30 |
Average shares outstanding |  | 125.7 |  |  | 125.7 |  |  | 125.7 |  |  | 125.7 |

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- References No definition available. + Details
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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