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Business Segments (Details8) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                
Inventory valuation reserves $ 126,900,000       $ 104,100,000 $ 126,900,000 $ 104,100,000  
Segment EBITDA           244,600,000 528,800,000 $ 566,700,000
LIFO and net realizable value reserves           0 (100,000) (700,000)
Corporate expenses           (40,900,000) (65,300,000) (57,300,000)
Closed operations and other expenses           (7,400,000) (24,000,000.0) (19,500,000)
Total ATI Adjusted EBITDA           196,300,000 439,400,000 489,200,000
Depreciation and amortization           (143,300,000) (151,100,000) (156,400,000)
Interest expense, net           (94,400,000) (99,000,000.0) (101,000,000.0)
Restructuring and other charges (1,105,100,000) $ (2,300,000) $ (16,700,000) $ (8,000,000.0) (4,500,000) (1,132,100,000) (4,500,000) 0
Impairment of goodwill     (287,000,000.0)     (287,000,000.0) 0 0
Non-cash joint venture impairment charge     (2,400,000)   (11,400,000) (2,400,000) (11,400,000) 0
Gain on joint venture deconsolidation           0 0 15,900,000
Debt extinguishment charge     $ (21,500,000)   $ (21,600,000) (21,500,000) (21,600,000) 0
Gain on asset sales, net           2,500,000 89,800,000 0
Income (loss) before income taxes           (1,481,900,000) 241,600,000 247,700,000
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           (143,300,000) (151,100,000) (156,400,000)
Operating Segments | High Performance Materials & Components                
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                
Segment EBITDA           129,600,000 356,200,000 360,300,000
Depreciation and amortization           (78,100,000) (84,600,000) (90,600,000)
Operating Segments | Advanced Alloys & Solutions [Member]                
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                
Segment EBITDA           115,000,000.0 172,600,000 206,400,000
Depreciation and amortization           $ (62,100,000) $ (63,500,000) $ (62,900,000)