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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Sales $ 1,018.7 $ 1,020.2 $ 3,103.9 $ 3,008.7
Cost of sales 859.0 859.8 2,635.4 2,526.0
Gross profit (loss) 159.7 160.4 468.5 482.7
Selling and administrative expenses 65.2 65.5 200.9 195.3
Operating income (loss) 94.5 94.9 267.6 287.4
Nonoperating retirement benefit expense (18.5) (8.4) (55.2) (25.5)
Interest income (expense), net (24.2) (24.8) (74.9) (75.8)
Other income (loss) including equity in income of unconsolidated subsidiaries 67.2 0.8 82.9 22.4
Income (loss) before income tax provision (benefit) 119.0 62.5 220.4 208.5
Income tax provision (benefit) 3.7 6.9 10.3 16.8
Net income 115.3 55.6 210.1 191.7
Less: Net income attributable to noncontrolling interests 4.3 5.1 9.0 10.4
Net income attributable to ATI 111.0 50.5 201.1 181.3
Comprehensive income (loss) attributable to ATI 134.0 50.8 273.5 217.8
Reportable Legal Entities | Parent Company        
Income Statement [Abstract]        
Sales 0.0 0.0 0.0 0.0
Cost of sales 3.2 3.7 9.3 11.7
Gross profit (loss) (3.2) (3.7) (9.3) (11.7)
Selling and administrative expenses 29.6 24.9 88.9 73.0
Operating income (loss) (32.8) (28.6) (98.2) (84.7)
Nonoperating retirement benefit expense (12.0) (3.1) (35.5) (9.7)
Interest income (expense), net (36.7) (34.9) (112.8) (102.1)
Other income (loss) including equity in income of unconsolidated subsidiaries 200.5 129.1 466.9 405.0
Income (loss) before income tax provision (benefit) 119.0 62.5 220.4 208.5
Income tax provision (benefit) 3.7 6.9 10.3 16.8
Net income 115.3 55.6 210.1 191.7
Less: Net income attributable to noncontrolling interests 0.0 0.0 0.0 0.0
Net income attributable to ATI 115.3 55.6 210.1 191.7
Comprehensive income (loss) attributable to ATI 133.7 46.9 279.5 223.0
Reportable Legal Entities | Subsidiary        
Income Statement [Abstract]        
Sales 389.2 357.4 1,091.4 1,047.0
Cost of sales 361.9 316.3 1,007.8 962.8
Gross profit (loss) 27.3 41.1 83.6 84.2
Selling and administrative expenses 8.9 7.3 24.3 25.2
Operating income (loss) 18.4 33.8 59.3 59.0
Nonoperating retirement benefit expense (6.2) (4.9) (18.5) (14.6)
Interest income (expense), net (33.3) (29.5) (101.5) (83.3)
Other income (loss) including equity in income of unconsolidated subsidiaries (2.2) 0.4 (8.8) 19.5
Income (loss) before income tax provision (benefit) (23.3) (0.2) (69.5) (19.4)
Income tax provision (benefit) (5.5) 1.4 (16.6) (2.9)
Net income (17.8) (1.6) (52.9) (16.5)
Less: Net income attributable to noncontrolling interests 0.0 0.0 0.0 0.0
Net income attributable to ATI (17.8) (1.6) (52.9) (16.5)
Comprehensive income (loss) attributable to ATI (14.5) 0.9 (43.3) (9.3)
Reportable Legal Entities | NonGuarantor Subsidiaries        
Income Statement [Abstract]        
Sales 629.5 662.8 2,012.5 1,961.7
Cost of sales 493.9 539.8 1,618.3 1,551.5
Gross profit (loss) 135.6 123.0 394.2 410.2
Selling and administrative expenses 26.7 33.3 87.7 97.1
Operating income (loss) 108.9 89.7 306.5 313.1
Nonoperating retirement benefit expense (0.3) (0.4) (1.2) (1.2)
Interest income (expense), net 45.8 39.6 139.4 109.6
Other income (loss) including equity in income of unconsolidated subsidiaries 69.2 (0.1) 90.6 0.6
Income (loss) before income tax provision (benefit) 223.6 128.8 535.3 422.1
Income tax provision (benefit) 28.7 21.2 85.8 66.3
Net income 194.9 107.6 449.5 355.8
Less: Net income attributable to noncontrolling interests 4.3 5.1 9.0 10.4
Net income attributable to ATI 190.6 102.5 440.5 345.4
Comprehensive income (loss) attributable to ATI 178.9 97.9 429.9 334.7
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
Operating income (loss) 0.0 0.0 0.0 0.0
Nonoperating retirement benefit expense 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 (200.3) (128.6) (465.8) (402.7)
Income (loss) before income tax provision (benefit) (200.3) (128.6) (465.8) (402.7)
Income tax provision (benefit) (23.2) (22.6) (69.2) (63.4)
Net income (177.1) (106.0) (396.6) (339.3)
Less: Net income attributable to noncontrolling interests 0.0 0.0 0.0 0.0
Net income attributable to ATI (177.1) (106.0) (396.6) (339.3)
Comprehensive income (loss) attributable to ATI $ (164.1) $ (94.9) $ (392.6) $ (330.6)