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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Sales | $ 1,020.2 | $ 869.1 | $ 3,008.7 | $ 2,615.2
Cost of sales | 859.8 | 763.8 | 2,526.0 | 2,260.8
Gross profit (loss) | 160.4 | 105.3 | 482.7 | 354.4
Selling and administrative expenses | 65.5 | 64.6 | 195.3 | 187.5
Impairment of goodwill | 0.0 | 114.4 | 0.0 | 114.4
Operating income (loss) | 94.9 | (73.7) | 287.4 | 52.5
Nonoperating retirement benefit expense | (8.4) | (13.6) | (25.5) | (40.9)
Interest income (expense), net | (24.8) | (34.2) | (75.8) | (102.2)
Other income (loss) including equity in income of unconsolidated subsidiaries | 0.8 | 0.2 | 22.4 | 3.7
Income (loss) before income tax provision (benefit) | 62.5 | (121.3) | 208.5 | (86.9)
Income tax provision (benefit) | 6.9 | (1.9) | 16.8 | (2.0)
Net income (loss) | 55.6 | (119.4) | 191.7 | (84.9)
Less: Net income attributable to noncontrolling interests | 5.1 | 1.8 | 10.4 | 8.7
Net income (loss) attributable to ATI | 50.5 | (121.2) | 181.3 | (93.6)
Comprehensive income (loss) attributable to ATI | 50.8 | (70.3) | 217.8 | (16.2)
Reportable Legal Entities | Parent Company |  |  |  |
Income Statement [Abstract] |  |  |  |
Sales | 0.0 | 0.0 | 0.0 | 0.0
Cost of sales | 3.7 | 3.4 | 11.7 | 12.5
Gross profit (loss) | (3.7) | (3.4) | (11.7) | (12.5)
Selling and administrative expenses | 24.9 | 24.8 | 73.0 | 66.8
Impairment of goodwill |  | 0.0 |  | 0.0
Operating income (loss) | (28.6) | (28.2) | (84.7) | (79.3)
Nonoperating retirement benefit expense | (3.1) | (8.0) | (9.7) | (24.2)
Interest income (expense), net | (34.9) | (40.1) | (102.1) | (118.4)
Other income (loss) including equity in income of unconsolidated subsidiaries | 129.1 | (45.0) | 405.0 | 135.0
Income (loss) before income tax provision (benefit) | 62.5 | (121.3) | 208.5 | (86.9)
Income tax provision (benefit) | 6.9 | (1.9) | 16.8 | (2.0)
Net income (loss) | 55.6 | (119.4) | 191.7 | (84.9)
Less: Net income attributable to noncontrolling interests | 0.0 | 0.0 | 0.0 | 0.0
Net income (loss) attributable to ATI | 55.6 | (119.4) | 191.7 | (84.9)
Comprehensive income (loss) attributable to ATI | 46.9 | (63.5) | 223.0 | (0.3)
Reportable Legal Entities | Subsidiary |  |  |  |
Income Statement [Abstract] |  |  |  |
Sales | 357.4 | 287.9 | 1,047.0 | 866.3
Cost of sales | 316.3 | 279.3 | 962.8 | 809.0
Gross profit (loss) | 41.1 | 8.6 | 84.2 | 57.3
Selling and administrative expenses | 7.3 | 8.4 | 25.2 | 26.5
Impairment of goodwill |  | 0.0 |  | 0.0
Operating income (loss) | 33.8 | 0.2 | 59.0 | 30.8
Nonoperating retirement benefit expense | (4.9) | (4.7) | (14.6) | (14.0)
Interest income (expense), net | (29.5) | (22.9) | (83.3) | (66.6)
Other income (loss) including equity in income of unconsolidated subsidiaries | 0.4 | 0.3 | 19.5 | 1.1
Income (loss) before income tax provision (benefit) | (0.2) | (27.1) | (19.4) | (48.7)
Income tax provision (benefit) | 1.4 | (8.6) | (2.9) | (16.3)
Net income (loss) | (1.6) | (18.5) | (16.5) | (32.4)
Less: Net income attributable to noncontrolling interests | 0.0 | 0.0 | 0.0 | 0.0
Net income (loss) attributable to ATI | (1.6) | (18.5) | (16.5) | (32.4)
Comprehensive income (loss) attributable to ATI | 0.9 | (15.5) | (9.3) | (27.1)
Reportable Legal Entities | NonGuarantor Subsidiaries |  |  |  |
Income Statement [Abstract] |  |  |  |
Sales | 662.8 | 581.2 | 1,961.7 | 1,748.9
Cost of sales | 539.8 | 481.1 | 1,551.5 | 1,439.3
Gross profit (loss) | 123.0 | 100.1 | 410.2 | 309.6
Selling and administrative expenses | 33.3 | 31.4 | 97.1 | 94.2
Impairment of goodwill |  | 114.4 |  | 114.4
Operating income (loss) | 89.7 | (45.7) | 313.1 | 101.0
Nonoperating retirement benefit expense | (0.4) | (0.9) | (1.2) | (2.7)
Interest income (expense), net | 39.6 | 28.8 | 109.6 | 82.8
Other income (loss) including equity in income of unconsolidated subsidiaries | (0.1) | (0.1) | 0.6 | 2.6
Income (loss) before income tax provision (benefit) | 128.8 | (17.9) | 422.1 | 183.7
Income tax provision (benefit) | 21.2 | 28.3 | 66.3 | 97.4
Net income (loss) | 107.6 | (46.2) | 355.8 | 86.3
Less: Net income attributable to noncontrolling interests | 5.1 | 1.8 | 10.4 | 8.7
Net income (loss) attributable to ATI | 102.5 | (48.0) | 345.4 | 77.6
Comprehensive income (loss) attributable to ATI | 97.9 | (28.5) | 334.7 | 109.9
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
Impairment of goodwill |  | 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 | (128.6) | 45.0 | (402.7) | (135.0)
Income (loss) before income tax provision (benefit) | (128.6) | 45.0 | (402.7) | (135.0)
Income tax provision (benefit) | (22.6) | (19.7) | (63.4) | (81.1)
Net income (loss) | (106.0) | 64.7 | (339.3) | (53.9)
Less: Net income attributable to noncontrolling interests | 0.0 | 0.0 | 0.0 | 0.0
Net income (loss) attributable to ATI | (106.0) | 64.7 | (339.3) | (53.9)
Comprehensive income (loss) attributable to ATI | $ (94.9) | $ 37.2 | $ (330.6) | $ (98.7)

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