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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 1,037.9 | $ 1,020.2 | $ 1,009.5 | $ 979.0 | $ 909.9 | $ 869.1 | $ 880.2 | $ 865.9 | $ 4,046.6 | $ 3,525.1 | $ 3,134.6
Cost of sales |  |  |  |  |  |  |  |  | 3,416.3 | 3,028.1 | 2,911.8
Gross profit | 147.6 | 160.4 | 173.7 | 148.6 | 142.6 | 105.3 | 124.3 | 124.8 | 630.3 | 497.0 | 222.8
Selling and administrative expenses |  |  |  |  |  |  |  |  | 268.2 | 248.0 | 240.8
Restructuring charges |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 523.8
Impairment of goodwill |  |  |  |  |  | 114.4 |  |  | 0.0 | 114.4 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 362.1 | 134.6 | (541.8)
Nonoperating retirement benefit expense |  |  |  |  |  |  |  |  | (33.9) | (54.3) | (70.6)
Interest expense, net |  |  |  |  |  |  |  |  | (101.0) | (133.8) | (124.0)
Debt extinguishment charge |  |  |  |  | (37.0) |  |  |  | 0.0 | (37.0) | 0.0
Other income (expense) including equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 20.5 | 4.0 | 2.4
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 247.7 | (86.5) | (734.0)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 11.0 | (6.8) | (106.9)
Net income (loss) | 45.0 | 55.6 | 75.6 | 60.5 | 5.2 | (119.4) | 13.4 | 21.1 | 236.7 | (79.7) | (627.1)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 14.3 | 12.2 | 13.8
Net income (loss) attributable to ATI | $ 41.1 | $ 50.5 | $ 72.8 | $ 58.0 | $ 1.7 | $ (121.2) | $ 10.1 | $ 17.5 | 222.4 | (91.9) | (640.9)
Legal Entities [Member] | Guarantor Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of sales |  |  |  |  |  |  |  |  | 16.6 | 14.6 | 18.6
Gross profit |  |  |  |  |  |  |  |  | (16.6) | (14.6) | (18.6)
Selling and administrative expenses |  |  |  |  |  |  |  |  | 101.7 | 86.6 | 84.5
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 0.0
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 0.0 |
Operating income (loss) |  |  |  |  |  |  |  |  | (118.3) | (101.2) | (103.1)
Nonoperating retirement benefit expense |  |  |  |  |  |  |  |  | (12.7) | (32.2) | 40.2
Interest expense, net |  |  |  |  |  |  |  |  | (138.8) | (155.8) | (138.3)
Debt extinguishment charge |  |  |  |  |  |  |  |  |  | (37.0) |
Other income (expense) including equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 517.5 | 239.7 | (452.4)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 247.7 | (86.5) | (734.0)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 11.0 | (6.8) | (106.9)
Net income (loss) |  |  |  |  |  |  |  |  | 236.7 | (79.7) | (627.1)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to ATI |  |  |  |  |  |  |  |  | 236.7 | (79.7) | (627.1)
Legal Entities [Member] | Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,410.3 | 1,178.9 | 983.6
Cost of sales |  |  |  |  |  |  |  |  | 1,302.4 | 1,085.5 | 1,080.2
Gross profit |  |  |  |  |  |  |  |  | 107.9 | 93.4 | (96.6)
Selling and administrative expenses |  |  |  |  |  |  |  |  | 34.2 | 36.9 | 31.7
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 21.7
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 0.0 |
Operating income (loss) |  |  |  |  |  |  |  |  | 73.7 | 56.5 | (150.0)
Nonoperating retirement benefit expense |  |  |  |  |  |  |  |  | (19.5) | (18.7) | 25.8
Interest expense, net |  |  |  |  |  |  |  |  | (114.6) | (90.0) | (70.7)
Debt extinguishment charge |  |  |  |  |  |  |  |  |  | 0.0 |
Other income (expense) including equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 16.8 | 1.6 | 1.0
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (43.6) | (50.6) | (245.5)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (8.7) | (16.6) | (85.5)
Net income (loss) |  |  |  |  |  |  |  |  | (34.9) | (34.0) | (160.0)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to ATI |  |  |  |  |  |  |  |  | (34.9) | (34.0) | (160.0)
Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,636.3 | 2,346.2 | 2,151.0
Cost of sales |  |  |  |  |  |  |  |  | 2,097.3 | 1,928.0 | 1,813.0
Gross profit |  |  |  |  |  |  |  |  | 539.0 | 418.2 | 338.0
Selling and administrative expenses |  |  |  |  |  |  |  |  | 132.3 | 124.5 | 124.6
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 502.1
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 114.4 |
Operating income (loss) |  |  |  |  |  |  |  |  | 406.7 | 179.3 | (288.7)
Nonoperating retirement benefit expense |  |  |  |  |  |  |  |  | (1.7) | (3.4) | 4.6
Interest expense, net |  |  |  |  |  |  |  |  | 152.4 | 112.0 | 85.0
Debt extinguishment charge |  |  |  |  |  |  |  |  |  | 0.0 |
Other income (expense) including equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 0.8 | 2.4 | 1.4
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 558.2 | 290.3 | (206.9)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 83.9 | 131.4 | (66.7)
Net income (loss) |  |  |  |  |  |  |  |  | 474.3 | 158.9 | (140.2)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 14.3 | 12.2 | 13.8
Net income (loss) attributable to ATI |  |  |  |  |  |  |  |  | 460.0 | 146.7 | (154.0)
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gross profit |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 0.0
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 0.0 |
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Nonoperating retirement benefit expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Debt extinguishment charge |  |  |  |  |  |  |  |  |  | 0.0 |
Other income (expense) including equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | (514.6) | (239.7) | 452.4
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (514.6) | (239.7) | 452.4
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (75.2) | (114.8) | 152.2
Net income (loss) |  |  |  |  |  |  |  |  | (439.4) | (124.9) | 300.2
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to ATI |  |  |  |  |  |  |  |  | $ (439.4) | $ (124.9) | $ 300.2

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