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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - 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
Condensed Financial Statements, Captions [Line Items]                      
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
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 (expense) including equity in income of unconsolidated subsidiaries                 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)
Legal Entities [Member] | Guarantor Parent [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 0.0 0.0 0.0
Cost of sales                 42.4 53.4 27.3
Gross profit                 (42.4) (53.4) (27.3)
Selling and administrative expenses                 91.0 89.9 88.2
Impairment of goodwill                 0.0   0.0
Restructuring charges                   0.0 1.6
Operating income (loss)                 (133.4) (143.3) (117.1)
Interest expense, net                 (155.8) (138.3) (117.3)
Debt extinguishment charge                 (37.0)    
Other income (expense) including equity in income of unconsolidated subsidiaries                 239.7 (452.4) (243.6)
Loss before income taxes                 (86.5) (734.0) (478.0)
Income tax benefit                 (6.8) (106.9) (112.1)
Net loss                 (79.7) (627.1) (365.9)
Less: Net income attributable to noncontrolling interests                 0.0 0.0 0.0
Net loss attributable to ATI                 (79.7) (627.1) (365.9)
Legal Entities [Member] | Subsidiary [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 1,178.9 983.6 1,453.2
Cost of sales                 1,103.5 1,102.0 1,643.2
Gross profit                 75.4 (118.4) (190.0)
Selling and administrative expenses                 37.6 32.3 29.4
Impairment of goodwill                 0.0   126.6
Restructuring charges                   25.1 58.0
Operating income (loss)                 37.8 (175.8) (404.0)
Interest expense, net                 (90.0) (70.7) (50.9)
Debt extinguishment charge                 0.0    
Other income (expense) including equity in income of unconsolidated subsidiaries                 1.6 1.0 1.1
Loss before income taxes                 (50.6) (245.5) (453.8)
Income tax benefit                 (16.6) (85.5) (165.7)
Net loss                 (34.0) (160.0) (288.1)
Less: Net income attributable to noncontrolling interests                 0.0 0.0 0.0
Net loss attributable to ATI                 (34.0) (160.0) (288.1)
Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 2,346.2 2,151.0 2,266.4
Cost of sales                 1,930.2 1,816.7 1,988.8
Gross profit                 416.0 334.3 277.6
Selling and administrative expenses                 125.7 125.5 121.2
Impairment of goodwill                 114.4   0.0
Restructuring charges                   502.1 4.7
Operating income (loss)                 175.9 (293.3) 151.7
Interest expense, net                 112.0 85.0 58.0
Debt extinguishment charge                 0.0    
Other income (expense) including equity in income of unconsolidated subsidiaries                 2.4 1.4 0.8
Loss before income taxes                 290.3 (206.9) 210.5
Income tax benefit                 131.4 (66.7) 51.6
Net loss                 158.9 (140.2) 158.9
Less: Net income attributable to noncontrolling interests                 12.2 13.8 12.0
Net loss attributable to ATI                 146.7 (154.0) 146.9
Eliminations [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 0.0 0.0 0.0
Cost of sales                 0.0 0.0 0.0
Gross profit                 0.0 0.0 0.0
Selling and administrative expenses                 0.0 0.0 0.0
Impairment of goodwill                 0.0   0.0
Restructuring charges                   0.0 0.0
Operating income (loss)                 0.0 0.0 0.0
Interest expense, net                 0.0 0.0 0.0
Debt extinguishment charge                 0.0    
Other income (expense) including equity in income of unconsolidated subsidiaries                 (239.7) 452.4 243.3
Loss before income taxes                 (239.7) 452.4 243.3
Income tax benefit                 (114.8) 152.2 114.1
Net loss                 (124.9) 300.2 129.2
Less: Net income attributable to noncontrolling interests                 0.0 0.0 0.0
Net loss attributable to ATI                 $ (124.9) $ 300.2 $ 129.2