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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
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
2017 - |  |  |  |  |  |  |  |
Sales |  | $ | 865.9 |  |  | $ | 880.2 |  |  | $ | 869.1 |  |  | $ | 909.9 |
Gross Profit |  | 112.8 |  |  | 112.3 |  |  | 93.3 |  |  | 130.6 |
Net income (loss) |  | 21.1 |  |  | 13.4 |  |  | (119.4 | ) |  | 5.2 |
Net income (loss) attributable to ATI |  | 17.5 |  |  | 10.1 |  |  | (121.2 | ) |  | 1.7 |
Basic income (loss) attributable to ATI per common share |  | $ | 0.16 |  |  | $ | 0.09 |  |  | $ | (1.12 | ) |  | $ | 0.01 |
Diluted income (loss) attributable to ATI per common share |  | $ | 0.16 |  |  | $ | 0.09 |  |  | $ | (1.12 | ) |  | $ | 0.01 |
Average shares outstanding |  | 108.8 |  |  | 108.9 |  |  | 108.9 |  |  | 118.6 |
2016 - |  |  |  |  |  |  |  |
Sales |  | $ | 757.5 |  |  | $ | 810.5 |  |  | $ | 770.5 |  |  | $ | 796.1 |
Gross Profit (loss) |  | (33.2 | ) |  | 48.2 |  |  | 50.2 |  |  | 97.3 |
Net income (loss) |  | (98.1 | ) |  | (15.5 | ) |  | (527.2 | ) |  | 13.7 |
Net income (loss) attributable to ATI |  | (101.2 | ) |  | (18.8 | ) |  | (530.8 | ) |  | 9.9 |
Basic income (loss) attributable to ATI per common share |  | $ | (0.94 | ) |  | $ | (0.18 | ) |  | $ | (4.95 | ) |  | $ | 0.09 |
Diluted income (loss) attributable to ATI per common share |  | $ | (0.94 | ) |  | $ | (0.18 | ) |  | $ | (4.95 | ) |  | $ | 0.09 |
Average shares outstanding |  | 109.0 |  |  | 108.9 |  |  | 108.9 |  |  | 108.9 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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