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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 796.1 $ 770.5 $ 810.5 $ 757.5 $ 738.9 $ 832.7 $ 1,022.5 $ 1,125.5 $ 3,134.6 $ 3,719.6 $ 4,223.4
Gross profit 97.3 50.2 48.2 (33.2) (97.5) (28.7) 77.0 109.5 162.5 60.3 378.6
Net income (loss) 13.7 (527.2) (15.5) (98.1) (223.3) (141.3) (13.9) 12.6 (627.1) (365.9) 9.6
Net income (loss) attributable to ATI $ 9.9 $ (530.8) $ (18.8) $ (101.2) $ (226.9) $ (144.6) $ (16.4) $ 10.0 $ (640.9) $ (377.9) $ (2.6)
Basic income (loss) from continuing operations attributable to ATI per common share (in dollars per share)                 $ (5.97) $ (3.53) $ (0.02)
Basic net income (loss) attributable to ATI per common share (in dollars per share) $ 0.09 $ (4.95) $ (0.18) $ (0.94) $ (2.12) $ (1.35) $ (0.15) $ 0.09 (5.97) (3.53) (0.03)
Diluted income (loss) from continuing operations attributable to ATI per common share (in dollars per share)                 (5.97) (3.53) (0.02)
Diluted net income (loss) attributable to ATI per common share (in dollars per share) $ 0.09 $ (4.95) $ (0.18) $ (0.94) $ (2.12) $ (1.35) $ (0.15) $ 0.09 $ (5.97) $ (3.53) $ (0.03)
Average shares outstanding (shares) 108.9 108.9 108.9 109.0 109.2 109.2 109.2 108.9 107.3 107.3 107.1