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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Sales $ 770.3 $ 1,080.4 $ 1,725.8 $ 2,085.2
Operating profit (loss) 27.3 114.5 108.5 176.2
LIFO and net realizable value reserves 0.0 0.0 0.0 (0.1)
Corporate expenses (7.7) (18.0) (20.5) (34.6)
Closed operations and other income (expense) 2.4 (7.9) (4.2) (11.0)
Restructuring and other charges (16.7) 0.0 (24.7) 0.0
Impairment of goodwill (287.0) 0.0 (287.0) 0.0
Income (loss) from equity investments (1.9) (3.5) (5.6) (6.3)
Gain on asset sales, net 0.0 21.6 2.5 21.6
Debt extinguishment charge (21.5) 0.0 (21.5) 0.0
Interest expense, net (21.7) (25.9) (43.6) (50.7)
(Loss) income before income taxes (327.3) 84.3 (292.9) 101.4
Allegheny & Tsingshan Stainless | Employee Severance [Member]        
Segment Reporting Information [Line Items]        
Income (loss) from equity investments (2.4) 0.0 (2.4) 0.0
Advanced Alloys & Solutions [Member] | Allegheny & Tsingshan Stainless        
Segment Reporting Information [Line Items]        
Income (loss) from equity investments (4.6) (4.0) (8.5) (7.3)
Operating Segments        
Segment Reporting Information [Line Items]        
Sales 822.9 1,165.6 1,859.0 2,254.1
Operating Segments | High Performance Materials & Components        
Segment Reporting Information [Line Items]        
Sales 316.7 552.8 765.2 1,069.1
Operating profit (loss) 9.2 78.4 66.3 130.1
Operating Segments | Advanced Alloys & Solutions [Member]        
Segment Reporting Information [Line Items]        
Sales 506.2 612.8 1,093.8 1,185.0
Operating profit (loss) 18.1 36.1 42.2 46.1
Internal Customers | Operating Segments        
Segment Reporting Information [Line Items]        
Sales 52.6 85.2 133.2 168.9
Internal Customers | Operating Segments | High Performance Materials & Components        
Segment Reporting Information [Line Items]        
Sales 16.0 19.7 44.2 39.4
Internal Customers | Operating Segments | Advanced Alloys & Solutions [Member]        
Segment Reporting Information [Line Items]        
Sales 36.6 65.5 89.0 129.5
External Customers | Operating Segments        
Segment Reporting Information [Line Items]        
Sales 770.3 1,080.4 1,725.8 2,085.2
External Customers | Operating Segments | High Performance Materials & Components        
Segment Reporting Information [Line Items]        
Sales 300.7 533.1 721.0 1,029.7
External Customers | Operating Segments | Advanced Alloys & Solutions [Member]        
Segment Reporting Information [Line Items]        
Sales $ 469.6 $ 547.3 $ 1,004.8 $ 1,055.5