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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]          
Sales $ 880.2 $ 810.5   $ 1,746.1 $ 1,568.0
Cost of sales 767.9 762.3   1,521.0 1,553.0
Gross profit (loss) 112.3 48.2   225.1 15.0
Selling and administrative expenses 66.7 59.3   126.2 121.9
Restructuring charges 0.0 1.0 $ 9.0 0.0 10.0
Operating income (loss) 45.6 (12.1)   98.9 (116.9)
Interest income (expense), net (34.5) (30.3)   (68.0) (58.6)
Other income (loss) including equity in income of unconsolidated subsidiaries 0.2 1.0   3.5 1.8
Income (loss) before income tax provision (benefit) 11.3 (41.4)   34.4 (173.7)
Income tax provision (benefit) (2.1) (25.9)   (0.1) (60.1)
Net income (loss) 13.4 (15.5)   34.5 (113.6)
Less: Net income attributable to noncontrolling interests 3.3 3.3   6.9 6.4
Net income (loss) attributable to ATI 10.1 (18.8)   27.6 (120.0)
Comprehensive income (loss) attributable to ATI 14.3 2.4   54.1 (79.2)
Reportable Legal Entities | Parent Company          
Income Statement [Abstract]          
Sales 0.0 0.0   0.0 0.0
Cost of sales 12.0 9.6   23.0 29.0
Gross profit (loss) (12.0) (9.6)   (23.0) (29.0)
Selling and administrative expenses 23.1 20.6   44.3 42.5
Restructuring charges   0.0     0.0
Operating income (loss) (35.1) (30.2)   (67.3) (71.5)
Interest income (expense), net (39.7) (33.7)   (78.3) (64.9)
Other income (loss) including equity in income of unconsolidated subsidiaries 86.1 22.5   180.0 (37.3)
Income (loss) before income tax provision (benefit) 11.3 (41.4)   34.4 (173.7)
Income tax provision (benefit) (2.1) (25.9)   (0.1) (60.1)
Net income (loss) 13.4 (15.5)   34.5 (113.6)
Less: Net income attributable to noncontrolling interests 0.0 0.0   0.0 0.0
Net income (loss) attributable to ATI 13.4 (15.5)   34.5 (113.6)
Comprehensive income (loss) attributable to ATI 17.8 4.2   63.2 (75.8)
Reportable Legal Entities | Subsidiary          
Income Statement [Abstract]          
Sales 291.2 260.9   578.4 474.7
Cost of sales 278.6 286.9   538.7 585.4
Gross profit (loss) 12.6 (26.0)   39.7 (110.7)
Selling and administrative expenses 8.7 4.9   18.4 14.6
Restructuring charges   0.0     9.0
Operating income (loss) 3.9 (30.9)   21.3 (134.3)
Interest income (expense), net (22.5) (17.6)   (43.7) (31.7)
Other income (loss) including equity in income of unconsolidated subsidiaries 0.3 0.3   0.8 0.4
Income (loss) before income tax provision (benefit) (18.3) (48.2)   (21.6) (165.6)
Income tax provision (benefit) (6.6) (17.6)   (7.7) (61.0)
Net income (loss) (11.7) (30.6)   (13.9) (104.6)
Less: Net income attributable to noncontrolling interests 0.0 0.0   0.0 0.0
Net income (loss) attributable to ATI (11.7) (30.6)   (13.9) (104.6)
Comprehensive income (loss) attributable to ATI (11.3) (29.3)   (11.6) (87.2)
Reportable Legal Entities | NonGuarantor Subsidiaries          
Income Statement [Abstract]          
Sales 589.0 549.6   1,167.7 1,093.3
Cost of sales 477.3 465.8   959.3 938.6
Gross profit (loss) 111.7 83.8   208.4 154.7
Selling and administrative expenses 34.9 33.8   63.5 64.8
Restructuring charges   1.0     1.0
Operating income (loss) 76.8 49.0   144.9 88.9
Interest income (expense), net 27.7 21.0   54.0 38.0
Other income (loss) including equity in income of unconsolidated subsidiaries (0.1) 0.9   2.7 1.7
Income (loss) before income tax provision (benefit) 104.4 70.9   201.6 128.6
Income tax provision (benefit) 33.6 25.8   69.1 49.5
Net income (loss) 70.8 45.1   132.5 79.1
Less: Net income attributable to noncontrolling interests 3.3 3.3   6.9 6.4
Net income (loss) attributable to ATI 67.5 41.8   125.6 72.7
Comprehensive income (loss) attributable to ATI 92.5 33.7   138.4 61.0
Eliminations          
Income Statement [Abstract]          
Sales 0.0 0.0   0.0 0.0
Cost of sales 0.0 0.0   0.0 0.0
Gross profit (loss) 0.0 0.0   0.0 0.0
Selling and administrative expenses 0.0 0.0   0.0 0.0
Restructuring charges   0.0     0.0
Operating income (loss) 0.0 0.0   0.0 0.0
Interest income (expense), net 0.0 0.0   0.0 0.0
Other income (loss) including equity in income of unconsolidated subsidiaries (86.1) (22.7)   (180.0) 37.0
Income (loss) before income tax provision (benefit) (86.1) (22.7)   (180.0) 37.0
Income tax provision (benefit) (27.0) (8.2)   (61.4) 11.5
Net income (loss) (59.1) (14.5)   (118.6) 25.5
Less: Net income attributable to noncontrolling interests 0.0 0.0   0.0 0.0
Net income (loss) attributable to ATI (59.1) (14.5)   (118.6) 25.5
Comprehensive income (loss) attributable to ATI $ (84.7) $ (6.2)   $ (135.9) $ 22.8