| Fiscal period | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|
| Period End Date | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 | 12/31/2015 |
|---|
| Sales | 4,362.10 | 4,173.70 | 3,836.00 | 2,799.80 | 2,982.10 | 4,122.50 | 4,046.60 | 3,525.10 | 3,134.60 | 3,719.60 |
| Total Revenues | 4,362.10 | 4,173.70 | 3,836.00 | 2,799.80 | 2,982.10 | 4,122.50 | 4,046.60 | 3,525.10 | 3,134.60 | 3,719.60 |
| Cost of sales | 3,463.90 | 3,371.10 | 3,121.80 | 2,466.60 | 2,689.30 | 3,484.70 | 3,416.30 | 3,076.10 | 2,972.10 | 3,659.30 |
| Gross profit (loss) | 898.20 | 802.60 | 714.20 | 333.20 | 292.80 | 637.80 | 630.30 | 449.00 | 162.50 | -- |
| Impairment of goodwill | -- | -- | -- | -- | 287.00 | -- | -- | 114.40 | -- | 126.60 |
| Selling and administrative expenses | 342.30 | 328.10 | 297.50 | 226.90 | 201.00 | 267.20 | 268.20 | 254.30 | 247.70 | 238.80 |
| Restructuring Costs | 4.10 | 7.70 | (4.80) | (11.30) | 1,107.50 | 4.50 | -- | -- | 527.20 | 64.30 |
| Loss (gain) on asset sales and sales of businesses, net | 57.10 | (0.40) | (134.20) | -- | -- | -- | -- | -- | -- | -- |
| Operating Income (Loss) | 608.90 | 466.40 | 287.30 | 117.60 | (1,302.70) | 366.10 | 362.10 | 80.30 | (612.40) | -- |
| Interest expense, net | 108.20 | 92.80 | 87.40 | 96.90 | 94.40 | 99.00 | 101.00 | 133.80 | 124.00 | 110.20 |
| Other income (expense) | 14.40 | 1.30 | (12.50) | 18.20 | (1.20) | 69.70 | 20.50 | 4.00 | 2.40 | 1.60 |
| Debt extinguishment costs | -- | -- | -- | (65.50) | (21.50) | (21.60) | -- | (37.00) | -- | -- |
| Nonoperating retirement benefit expense | (29.00) | (79.70) | (25.40) | 37.20 | (62.10) | (73.60) | (33.90) | -- | -- | -- |
| Income before income tax provision | 486.10 | 295.20 | 162.00 | 10.60 | (1,481.90) | 241.60 | 247.70 | (86.50) | (734.00) | (478.00) |
| Current- Foreign | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Current: Federal | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Current: State | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Deferred: Federal | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Deferred: State | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Deferred: Foreign | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income tax provision (benefit) | 103.40 | (128.20) | 15.50 | 26.80 | 77.70 | (28.50) | 11.00 | (6.80) | (106.90) | (112.10) |
| INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE EXTRAORDINARY GAINS | 382.70 | -- | -- | (16.20) | (1,559.60) | -- | -- | -- | (627.10) | (365.90) |
| Income from discontinued operations, net of income taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Income (loss) before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle,net of tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Consolidated Net Income (Loss) | -- | 423.40 | 146.50 | (16.20) | (1,559.60) | 270.10 | 236.70 | (79.70) | (627.10) | (365.90) |
| Less: Net income (loss)attributable to noncontrolling interests | 14.90 | 12.60 | 15.60 | 22.00 | 13.00 | 12.50 | 14.30 | 12.20 | 13.80 | 12.00 |
| 4.75% Convertible Senior Notes due 2022 | -- | -- | -- | -- | -- | (12.80) | (12.90) | -- | -- | -- |
| Net income attributable to ATI | 367.80 | 410.80 | 130.90 | (38.20) | (1,572.60) | 270.40 | 235.30 | (91.90) | (640.90) | (377.90) |
| Net income available to ATI (For diluted net income per common share ) | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income (loss) from continuing operations | -- | -- | -- | -- | -- | -- | -- | -- | (5.97) | (3.53) |
| EPS (Basic) : Discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle- Basic | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Earnings Per Share (Basic) | 2.82 | 3.21 | 1.03 | (0.30) | (12.43) | 2.05 | 1.78 | (0.83) | (5.97) | (3.53) |
| Income (loss) from continuing operations | -- | -- | -- | -- | -- | -- | -- | -- | (5.97) | (3.53) |
| EPS (Diluted) : Discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle- Diluted | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Earnings Per Share (Diluted) | 2.55 | 2.81 | 0.96 | (0.30) | (12.43) | 1.85 | 1.61 | (0.83) | (5.97) | (3.53) |
| Weighted Average Shares Outstanding (Basic) | 130.40 | 128.10 | 127.50 | 127.10 | 126.50 | 125.80 | 125.20 | 110.10 | 107.30 | 107.30 |
| Weighted Average Shares Outstanding (Diluted) | 146.60 | 150.00 | 151.20 | 127.10 | 126.50 | 146.50 | 145.90 | 110.10 | 107.30 | 107.30 |