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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 909.9 | $ 869.1 | $ 880.2 | $ 865.9 | $ 796.1 | $ 770.5 | $ 810.5 | $ 757.5 | $ 3,525.1 | $ 3,134.6 | $ 3,719.6
Gross profit | 130.6 | 93.3 | 112.3 | 112.8 | 97.3 | 50.2 | 48.2 | (33.2) | 449.0 | 162.5 | 60.3
Net income (loss) | 5.2 | (119.4) | 13.4 | 21.1 | 13.7 | (527.2) | (15.5) | (98.1) | (79.7) | (627.1) | (365.9)
Net income (loss) attributable to ATI | $ 1.7 | $ (121.2) | $ 10.1 | $ 17.5 | $ 9.9 | $ (530.8) | $ (18.8) | $ (101.2) | $ (91.9) | $ (640.9) | $ (377.9)
Basic income (loss) attributable to ATI per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.83) | $ (5.97) | $ (3.53)
Basic net income (loss) attributable to ATI per common share (in dollars per share) | $ 0.01 | $ (1.12) | $ 0.09 | $ 0.16 | $ 0.09 | $ (4.95) | $ (0.18) | $ (0.94) | (0.83) | (5.97) | (3.53)
Diluted income (loss) attributable to ATI per common share (in dollars per share) |  |  |  |  |  |  |  |  | (0.83) | (5.97) | (3.53)
Diluted net income (loss) attributable to ATI per common share (in dollars per share) | $ 0.01 | $ (1.12) | $ 0.09 | $ 0.16 | $ 0.09 | $ (4.95) | $ (0.18) | $ (0.94) | $ (0.83) | $ (5.97) | $ (3.53)
Average shares outstanding (shares) | 118.6 | 108.9 | 108.9 | 108.8 | 108.9 | 108.9 | 108.9 | 109.0 | 110.1 | 107.3 | 107.3

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