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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Sales $ 865.9 $ 757.5
Cost of sales 753.1 790.7
Gross profit (loss) 112.8 (33.2)
Selling and administrative expenses 59.5 62.6
Restructuring charges 0.0 9.0
Operating income (loss) 53.3 (104.8)
Interest income (expense), net (33.5) (28.3)
Other income (loss) including equity in income of unconsolidated subsidiaries 3.3 0.8
Income (loss) before income tax provision (benefit) 23.1 (132.3)
Income tax provision (benefit) 2.0 (34.2)
Net income (loss) 21.1 (98.1)
Less: Net income attributable to noncontrolling interests 3.6 3.1
Net income (loss) attributable to ATI 17.5 (101.2)
Comprehensive income (loss) attributable to ATI 39.8 (81.6)
Reportable Legal Entities | Parent Company    
Income Statement [Abstract]    
Sales 0.0 0.0
Cost of sales 11.0 19.4
Gross profit (loss) (11.0) (19.4)
Selling and administrative expenses 21.2 21.9
Restructuring charges   0.0
Operating income (loss) (32.2) (41.3)
Interest income (expense), net (38.6) (31.2)
Other income (loss) including equity in income of unconsolidated subsidiaries 93.9 (59.8)
Income (loss) before income tax provision (benefit) 23.1 (132.3)
Income tax provision (benefit) 2.0 (34.2)
Net income (loss) 21.1 (98.1)
Less: Net income attributable to noncontrolling interests 0.0 0.0
Net income (loss) attributable to ATI 21.1 (98.1)
Comprehensive income (loss) attributable to ATI 45.4 (80.0)
Reportable Legal Entities | Subsidiary    
Income Statement [Abstract]    
Sales 287.2 213.8
Cost of sales 260.1 298.5
Gross profit (loss) 27.1 (84.7)
Selling and administrative expenses 9.7 9.7
Restructuring charges   9.0
Operating income (loss) 17.4 (103.4)
Interest income (expense), net (21.2) (14.1)
Other income (loss) including equity in income of unconsolidated subsidiaries 0.5 0.1
Income (loss) before income tax provision (benefit) (3.3) (117.4)
Income tax provision (benefit) (1.1) (43.4)
Net income (loss) (2.2) (74.0)
Less: Net income attributable to noncontrolling interests 0.0 0.0
Net income (loss) attributable to ATI (2.2) (74.0)
Comprehensive income (loss) attributable to ATI (0.3) (57.9)
Reportable Legal Entities | NonGuarantor Subsidiaries    
Income Statement [Abstract]    
Sales 578.7 543.7
Cost of sales 482.0 472.8
Gross profit (loss) 96.7 70.9
Selling and administrative expenses 28.6 31.0
Restructuring charges   0.0
Operating income (loss) 68.1 39.9
Interest income (expense), net 26.3 17.0
Other income (loss) including equity in income of unconsolidated subsidiaries 2.8 0.8
Income (loss) before income tax provision (benefit) 97.2 57.7
Income tax provision (benefit) 35.5 23.7
Net income (loss) 61.7 34.0
Less: Net income attributable to noncontrolling interests 3.6 3.1
Net income (loss) attributable to ATI 58.1 30.9
Comprehensive income (loss) attributable to ATI 45.9 27.3
Eliminations    
Income Statement [Abstract]    
Sales 0.0 0.0
Cost of sales 0.0 0.0
Gross profit (loss) 0.0 0.0
Selling and administrative expenses 0.0 0.0
Restructuring charges   0.0
Operating income (loss) 0.0 0.0
Interest income (expense), net 0.0 0.0
Other income (loss) including equity in income of unconsolidated subsidiaries (93.9) 59.7
Income (loss) before income tax provision (benefit) (93.9) 59.7
Income tax provision (benefit) (34.4) 19.7
Net income (loss) (59.5) 40.0
Less: Net income attributable to noncontrolling interests 0.0 0.0
Net income (loss) attributable to ATI (59.5) 40.0
Comprehensive income (loss) attributable to ATI $ (51.2) $ 29.0