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v3.23.2

Business Segments - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) segment | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of business segments | segment |  |  |  | 2 |  |
Government sponsored COVID relief income |  |  | $ 5,600,000 |  | $ 34,300,000 |
Gain (Loss) on sale of business | $ (700,000) |  | (115,900,000) | $ (700,000) | (134,200,000) |
Litigation Reserve | 0 |  | 0 | 0 | 8,600,000 |
Restructuring charges (credits) | 2,700,000 |  | (1,300,000) | 2,700,000 | (2,400,000) |
Loss on asset sales and sales of businesses, net |  |  | (115,900,000) |  | (134,200,000) |
Restructuring and other credits (charges) | (9,200,000) |  | 1,300,000 | (10,400,000) | (6,200,000) |
Start Up Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges (credits) | 4,500,000 | $ 1,200,000 |  |  |  |
Asset Write-offs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges (credits) | 2,000,000 |  |  |  |  |
Facility Closing |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Depreciation | 800,000 |  |  | 800,000 |  |
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debt, Gross | 291,400,000 |  |  | 291,400,000 |  | $ 291,400,000
Sheffield, UK Operations |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain (Loss) on sale of business |  |  |  |  | (141,000,000) |
Pico Rivera, CA Operations |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain (Loss) on sale of assets |  |  |  |  | 6,800,000 |
Northbrook, IL Operations |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Loss on asset sales and sales of businesses, net | $ (600,000) |  |  | $ (600,000) |  |
High Performance Materials & Components |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Employee retention credits and Aviation Manufacturing Jobs Protection Program |  |  | $ 5,600,000 |  | 27,500,000 |
Advanced Alloys & Solutions |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Employee retention credits |  |  |  |  | $ 6,800,000 |

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