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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Sales $ 979.0 $ 865.9
Cost of sales 830.4 741.1
Gross profit (loss) 148.6 124.8
Selling and administrative expenses 67.1 57.9
Operating income (loss) 81.5 66.9
Nonoperating retirement benefit expense (8.3) (13.6)
Interest income (expense), net (25.5) (33.5)
Other income (loss) including equity in income of unconsolidated subsidiaries 17.8 3.3
Income (loss) before income tax provision (benefit) 65.5 23.1
Income tax provision (benefit) 5.0 2.0
Net income (loss) 60.5 21.1
Less: Net income attributable to noncontrolling interests 2.5 3.6
Net income (loss) attributable to ATI 58.0 17.5
Comprehensive income (loss) attributable to ATI 93.6 39.8
Reportable Legal Entities | Parent Company    
Income Statement [Abstract]    
Sales 0.0 0.0
Cost of sales 4.1 4.0
Gross profit (loss) (4.1) (4.0)
Selling and administrative expenses 23.7 20.1
Operating income (loss) (27.8) (24.1)
Nonoperating retirement benefit expense (3.1) (8.1)
Interest income (expense), net (33.0) (38.6)
Other income (loss) including equity in income of unconsolidated subsidiaries 129.4 93.9
Income (loss) before income tax provision (benefit) 65.5 23.1
Income tax provision (benefit) 5.0 2.0
Net income (loss) 60.5 21.1
Less: Net income attributable to noncontrolling interests 0.0 0.0
Net income (loss) attributable to ATI 60.5 21.1
Comprehensive income (loss) attributable to ATI 103.0 45.4
Reportable Legal Entities | Subsidiary    
Income Statement [Abstract]    
Sales 346.4 287.2
Cost of sales 323.2 255.6
Gross profit (loss) 23.2 31.6
Selling and administrative expenses 10.3 9.5
Operating income (loss) 12.9 22.1
Nonoperating retirement benefit expense (4.9) (4.7)
Interest income (expense), net (25.7) (21.2)
Other income (loss) including equity in income of unconsolidated subsidiaries 16.8 0.5
Income (loss) before income tax provision (benefit) (0.9) (3.3)
Income tax provision (benefit) 0.2 (1.1)
Net income (loss) (1.1) (2.2)
Less: Net income attributable to noncontrolling interests 0.0 0.0
Net income (loss) attributable to ATI (1.1) (2.2)
Comprehensive income (loss) attributable to ATI 1.3 (0.3)
Reportable Legal Entities | NonGuarantor Subsidiaries    
Income Statement [Abstract]    
Sales 632.6 578.7
Cost of sales 503.1 481.5
Gross profit (loss) 129.5 97.2
Selling and administrative expenses 33.1 28.3
Operating income (loss) 96.4 68.9
Nonoperating retirement benefit expense (0.3) (0.8)
Interest income (expense), net 33.2 26.3
Other income (loss) including equity in income of unconsolidated subsidiaries 0.5 2.8
Income (loss) before income tax provision (benefit) 129.8 97.2
Income tax provision (benefit) 20.2 35.5
Net income (loss) 109.6 61.7
Less: Net income attributable to noncontrolling interests 2.5 3.6
Net income (loss) attributable to ATI 107.1 58.1
Comprehensive income (loss) attributable to ATI 124.0 45.9
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
Operating income (loss) 0.0 0.0
Nonoperating retirement benefit expense 0.0 0.0
Interest income (expense), net 0.0 0.0
Other income (loss) including equity in income of unconsolidated subsidiaries (128.9) (93.9)
Income (loss) before income tax provision (benefit) (128.9) (93.9)
Income tax provision (benefit) (20.4) (34.4)
Net income (loss) (108.5) (59.5)
Less: Net income attributable to noncontrolling interests 0.0 0.0
Net income (loss) attributable to ATI (108.5) (59.5)
Comprehensive income (loss) attributable to ATI $ (134.7) $ (51.2)