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Business Segments (Details8) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Inventory valuation reserves | $ 65,400,000 | $ 82,800,000 |
Segment EBITDA | 351,600,000 | 244,600,000 | $ 528,800,000
Corporate expenses | (55,900,000) | (40,900,000) | (65,300,000)
Closed operations and other expenses | (4,800,000) | (7,400,000) | (24,000,000.0)
Total ATI Adjusted EBITDA | 290,900,000 | 196,300,000 | 439,500,000
Depreciation and amortization | (143,900,000) | (143,300,000) | (151,100,000)
Interest expense, net | (96,900,000) | (94,400,000) | (99,000,000.0)
Restructuring and other charges | (10,500,000) | 1,132,100,000 | 4,500,000
Strike related costs | (63,200,000) | 0 | 0
Settlement gain | 64,900,000 | 0 | 0
Impairment of goodwill | 0 | (287,000,000) | 0
Joint venture restructuring and impairment charges | 0 | (2,400,000) | (11,400,000)
Debt extinguishment charge | (65,500,000) | (21,500,000) | (21,600,000)
Gain on asset sales and sale of business, net | 13,800,000 | 2,500,000 | 84,600,000
Income (loss) before income taxes | 10,600,000 | (1,481,900,000) | 236,500,000
High Performance Materials & Components |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Impairment of goodwill | 0 |  |
Operating Segments |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Depreciation and amortization | (143,900,000) | (143,300,000) | (151,100,000)
Operating Segments | High Performance Materials & Components |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Segment EBITDA | 159,900,000 | 129,600,000 | 356,200,000
Depreciation and amortization | (75,000,000.0) | (78,100,000) | (84,600,000)
Operating Segments | Advanced Alloys & Solutions [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Segment EBITDA | 191,700,000 | 115,000,000.0 | 172,600,000
Depreciation and amortization | $ (64,500,000) | $ (62,100,000) | $ (63,500,000)

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