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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Sales $ 1,080.4 $ 1,009.5 $ 2,085.2 $ 1,988.5
Cost of sales 902.7 835.8 1,776.4 1,666.2
Gross profit (loss) 177.7 173.7 308.8 322.3
Selling and administrative expenses 67.7 62.7 135.7 129.8
Operating income (loss) 110.0 111.0 173.1 192.5
Nonoperating retirement benefit expense (18.4) (8.8) (36.7) (17.1)
Interest income (expense), net (25.9) (25.5) (50.7) (51.0)
Other income (loss) including equity in income of unconsolidated subsidiaries 18.6 3.8 15.7 21.6
Income (loss) before income tax provision (benefit) 84.3 80.5 101.4 146.0
Income tax provision (benefit) 5.8 4.9 6.6 9.9
Net income 78.5 75.6 94.8 136.1
Less: Net income attributable to noncontrolling interests 3.4 2.8 4.7 5.3
Net income attributable to ATI 75.1 72.8 90.1 130.8
Comprehensive income (loss) attributable to ATI 86.2 73.4 139.5 167.0
Reportable Legal Entities | Parent Company        
Income Statement [Abstract]        
Sales 0.0 0.0 0.0 0.0
Cost of sales 2.9 3.9 6.1 8.0
Gross profit (loss) (2.9) (3.9) (6.1) (8.0)
Selling and administrative expenses 28.9 24.4 59.3 48.1
Operating income (loss) (31.8) (28.3) (65.4) (56.1)
Nonoperating retirement benefit expense (11.8) (3.5) (23.5) (6.6)
Interest income (expense), net (38.2) (34.2) (76.1) (67.2)
Other income (loss) including equity in income of unconsolidated subsidiaries 166.1 146.5 266.4 275.9
Income (loss) before income tax provision (benefit) 84.3 80.5 101.4 146.0
Income tax provision (benefit) 5.8 4.9 6.6 9.9
Net income 78.5 75.6 94.8 136.1
Less: Net income attributable to noncontrolling interests 0.0 0.0 0.0 0.0
Net income attributable to ATI 78.5 75.6 94.8 136.1
Comprehensive income (loss) attributable to ATI 86.0 73.1 145.8 176.1
Reportable Legal Entities | Subsidiary        
Income Statement [Abstract]        
Sales 366.7 343.2 702.2 689.6
Cost of sales 327.5 323.3 645.9 646.5
Gross profit (loss) 39.2 19.9 56.3 43.1
Selling and administrative expenses 8.0 7.6 15.4 17.9
Operating income (loss) 31.2 12.3 40.9 25.2
Nonoperating retirement benefit expense (6.1) (4.8) (12.3) (9.7)
Interest income (expense), net (34.3) (28.1) (68.2) (53.8)
Other income (loss) including equity in income of unconsolidated subsidiaries (3.7) 2.3 (6.6) 19.1
Income (loss) before income tax provision (benefit) (12.9) (18.3) (46.2) (19.2)
Income tax provision (benefit) (3.1) (4.5) (11.1) (4.3)
Net income (9.8) (13.8) (35.1) (14.9)
Less: Net income attributable to noncontrolling interests 0.0 0.0 0.0 0.0
Net income attributable to ATI (9.8) (13.8) (35.1) (14.9)
Comprehensive income (loss) attributable to ATI (6.7) (11.5) (28.8) (10.2)
Reportable Legal Entities | NonGuarantor Subsidiaries        
Income Statement [Abstract]        
Sales 713.7 666.3 1,383.0 1,298.9
Cost of sales 572.3 508.6 1,124.4 1,011.7
Gross profit (loss) 141.4 157.7 258.6 287.2
Selling and administrative expenses 30.8 30.7 61.0 63.8
Operating income (loss) 110.6 127.0 197.6 223.4
Nonoperating retirement benefit expense (0.5) (0.5) (0.9) (0.8)
Interest income (expense), net 46.6 36.8 93.6 70.0
Other income (loss) including equity in income of unconsolidated subsidiaries 21.8 0.2 21.4 0.7
Income (loss) before income tax provision (benefit) 178.5 163.5 311.7 293.3
Income tax provision (benefit) 27.2 24.9 57.1 45.1
Net income 151.3 138.6 254.6 248.2
Less: Net income attributable to noncontrolling interests 3.4 2.8 4.7 5.3
Net income attributable to ATI 147.9 135.8 249.9 242.9
Comprehensive income (loss) attributable to ATI 143.2 112.8 251.0 236.8
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 (165.6) (145.2) (265.5) (274.1)
Income (loss) before income tax provision (benefit) (165.6) (145.2) (265.5) (274.1)
Income tax provision (benefit) (24.1) (20.4) (46.0) (40.8)
Net income (141.5) (124.8) (219.5) (233.3)
Less: Net income attributable to noncontrolling interests 0.0 0.0 0.0 0.0
Net income attributable to ATI (141.5) (124.8) (219.5) (233.3)
Comprehensive income (loss) attributable to ATI $ (136.3) $ (101.0) $ (228.5) $ (235.7)