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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]                      
Sales $ 1,037.9 $ 1,020.2 $ 1,009.5 $ 979.0 $ 909.9 $ 869.1 $ 880.2 $ 865.9 $ 4,046.6 $ 3,525.1 $ 3,134.6
Cost of sales                 3,416.3 3,028.1 2,911.8
Gross profit 147.6 160.4 173.7 148.6 142.6 105.3 124.3 124.8 630.3 497.0 222.8
Selling and administrative expenses                 268.2 248.0 240.8
Restructuring charges                 0.0 0.0 523.8
Impairment of goodwill           114.4     0.0 114.4 0.0
Operating income (loss)                 362.1 134.6 (541.8)
Nonoperating retirement benefit expense                 (33.9) (54.3) (70.6)
Interest expense, net                 (101.0) (133.8) (124.0)
Debt extinguishment charge         (37.0)       0.0 (37.0) 0.0
Other income (expense) including equity in income of unconsolidated subsidiaries                 20.5 4.0 2.4
Income (loss) before income taxes                 247.7 (86.5) (734.0)
Income tax provision (benefit)                 11.0 (6.8) (106.9)
Net income (loss) 45.0 55.6 75.6 60.5 5.2 (119.4) 13.4 21.1 236.7 (79.7) (627.1)
Less: Net income attributable to noncontrolling interests                 14.3 12.2 13.8
Net income (loss) attributable to ATI $ 41.1 $ 50.5 $ 72.8 $ 58.0 $ 1.7 $ (121.2) $ 10.1 $ 17.5 222.4 (91.9) (640.9)
Legal Entities [Member] | Guarantor Parent [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 0.0 0.0 0.0
Cost of sales                 16.6 14.6 18.6
Gross profit                 (16.6) (14.6) (18.6)
Selling and administrative expenses                 101.7 86.6 84.5
Restructuring charges                     0.0
Impairment of goodwill                   0.0  
Operating income (loss)                 (118.3) (101.2) (103.1)
Nonoperating retirement benefit expense                 (12.7) (32.2) 40.2
Interest expense, net                 (138.8) (155.8) (138.3)
Debt extinguishment charge                   (37.0)  
Other income (expense) including equity in income of unconsolidated subsidiaries                 517.5 239.7 (452.4)
Income (loss) before income taxes                 247.7 (86.5) (734.0)
Income tax provision (benefit)                 11.0 (6.8) (106.9)
Net income (loss)                 236.7 (79.7) (627.1)
Less: Net income attributable to noncontrolling interests                 0.0 0.0 0.0
Net income (loss) attributable to ATI                 236.7 (79.7) (627.1)
Legal Entities [Member] | Subsidiary [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 1,410.3 1,178.9 983.6
Cost of sales                 1,302.4 1,085.5 1,080.2
Gross profit                 107.9 93.4 (96.6)
Selling and administrative expenses                 34.2 36.9 31.7
Restructuring charges                     21.7
Impairment of goodwill                   0.0  
Operating income (loss)                 73.7 56.5 (150.0)
Nonoperating retirement benefit expense                 (19.5) (18.7) 25.8
Interest expense, net                 (114.6) (90.0) (70.7)
Debt extinguishment charge                   0.0  
Other income (expense) including equity in income of unconsolidated subsidiaries                 16.8 1.6 1.0
Income (loss) before income taxes                 (43.6) (50.6) (245.5)
Income tax provision (benefit)                 (8.7) (16.6) (85.5)
Net income (loss)                 (34.9) (34.0) (160.0)
Less: Net income attributable to noncontrolling interests                 0.0 0.0 0.0
Net income (loss) attributable to ATI                 (34.9) (34.0) (160.0)
Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Sales                 2,636.3 2,346.2 2,151.0
Cost of sales                 2,097.3 1,928.0 1,813.0
Gross profit                 539.0 418.2 338.0
Selling and administrative expenses                 132.3 124.5 124.6
Restructuring charges                     502.1
Impairment of goodwill                   114.4  
Operating income (loss)                 406.7 179.3 (288.7)
Nonoperating retirement benefit expense                 (1.7) (3.4) 4.6
Interest expense, net                 152.4 112.0 85.0
Debt extinguishment charge                   0.0  
Other income (expense) including equity in income of unconsolidated subsidiaries                 0.8 2.4 1.4
Income (loss) before income taxes                 558.2 290.3 (206.9)
Income tax provision (benefit)                 83.9 131.4 (66.7)
Net income (loss)                 474.3 158.9 (140.2)
Less: Net income attributable to noncontrolling interests                 14.3 12.2 13.8
Net income (loss) attributable to ATI                 460.0 146.7 (154.0)
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
Restructuring charges                     0.0
Impairment of goodwill                   0.0  
Operating income (loss)                 0.0 0.0 0.0
Nonoperating retirement benefit expense                 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                 (514.6) (239.7) 452.4
Income (loss) before income taxes                 (514.6) (239.7) 452.4
Income tax provision (benefit)                 (75.2) (114.8) 152.2
Net income (loss)                 (439.4) (124.9) 300.2
Less: Net income attributable to noncontrolling interests                 0.0 0.0 0.0
Net income (loss) attributable to ATI                 $ (439.4) $ (124.9) $ 300.2