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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | $ 598.0 |  | $ 1,018.7 | $ 2,323.8 | $ 3,103.9
Operating profit (loss) | (6.8) |  | 99.2 | 101.7 | 275.4
LIFO and net realizable value reserves | 0.0 |  | 0.0 | 0.0 | (0.1)
Corporate expenses | (10.9) |  | (16.0) | (31.4) | (50.6)
Closed operations and other expense | (1.1) |  | (8.2) | (5.3) | (19.2)
Restructuring and other charges | (2.3) |  | 0.0 | (27.0) | 0.0
Impairment of goodwill | 0.0 |  | 0.0 | (287.0) | 0.0
Income (loss) from equity investments | (1.0) |  | (2.4) | (6.6) | (8.7)
Gain on asset sales, net | 0.0 |  | 68.2 | 2.5 | 89.8
Debt extinguishment charge | 0.0 |  | 0.0 | (21.5) | 0.0
Interest expense, net | (25.1) |  | (24.2) | (68.7) | (74.9)
Income (loss) before income taxes | (46.2) |  | 119.0 | (339.1) | 220.4
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  | 0.0 | (1.8)
Allegheny & Tsingshan Stainless | Employee Severance [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (loss) from equity investments | 0.0 | $ (2.4) | 0.0 | (2.4) | 0.0
Cast Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | 6.2 |  | 6.2
Forged Products |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | (0.4) |  | (8.1)
Advanced Alloys & Solutions [Member] | Allegheny & Tsingshan Stainless |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (loss) from equity investments | (1.6) |  | (2.6) | (10.1) | (9.9)
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 623.4 |  | 1,097.8 | 2,482.4 | 3,351.9
Operating Segments | High Performance Materials & Components |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 230.1 |  | 471.6 | 995.3 | 1,540.7
Operating profit (loss) | (2.7) |  | 68.4 | 63.6 | 198.5
Operating Segments | Advanced Alloys & Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 393.3 |  | 626.2 | 1,487.1 | 1,811.2
Operating profit (loss) | (4.1) |  | 30.8 | 38.1 | 76.9
Internal Customers | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 25.4 |  | 79.1 | 158.6 | 248.0
Internal Customers | Operating Segments | High Performance Materials & Components |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 8.8 |  | 19.8 | 53.0 | 59.2
Internal Customers | Operating Segments | Advanced Alloys & Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 16.6 |  | 59.3 | 105.6 | 188.8
External Customers | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 598.0 |  | 1,018.7 | 2,323.8 | 3,103.9
External Customers | Operating Segments | High Performance Materials & Components |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 221.3 |  | 451.8 | 942.3 | 1,481.5
External Customers | Operating Segments | Advanced Alloys & Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | $ 376.7 |  | $ 566.9 | $ 1,381.5 | $ 1,622.4

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