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Consolidated Statements of Operations - USD ($)
$ 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
Income Statement [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
Costs and expenses:                      
Cost of sales                 3,076.1 2,972.1 3,659.3
Gross profit 130.6 93.3 112.3 112.8 97.3 50.2 48.2 (33.2) 449.0 162.5 60.3
Selling and administrative expenses                 254.3 247.7 238.8
Impairment of goodwill   114.4             114.4 0.0 126.6
Restructuring charges                 0.0 527.2 64.3
Operating income (loss)                 80.3 (612.4) (369.4)
Interest expense, net                 (133.8) (124.0) (110.2)
Debt extinguishment charge (37.0)               (37.0) 0.0 0.0
Other income, net                 4.0 2.4 1.6
Loss before income taxes                 (86.5) (734.0) (478.0)
Income tax benefit                 (6.8) (106.9) (112.1)
Net loss 5.2 (119.4) 13.4 21.1 13.7 (527.2) (15.5) (98.1) (79.7) (627.1) (365.9)
Less: Net income attributable to noncontrolling interests                 12.2 13.8 12.0
Net 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 net income (loss) per common share                      
Continuing operations 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 net income (loss) per common share                      
Continuing operations 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)