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Business Segments - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) position | Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |
Gain on asset sales and sale of business, net | $ 13.8 | $ 2.5 | $ 84.6
Restructuring and Related Cost, Expected Number of Positions Eliminated | position |  | 1,400 |
Restructuring and other credits (charges) | 10.5 | $ (1,132.1) | (4.5)
Income (loss) from equity method investments | 0.1 | (7.0) | (10.7)
Total international sales | 1,264.9 | 1,173.0 | 1,667.9
Sales by U.S. operations to foreign countries | 846.3 | 812.3 | 1,262.6
Inventory valuation reserves | 65.4 | 82.8 |
Closed operations and other expenses | (4.8) | (7.4) | (24.0)
Gain (Loss) on Disposition of Oil and Gas and Timber Property |  |  | 91.7
Net gain (loss) on sale of businesses | $ 13.8 | 0.0 | (7.1)
Allegheny & Tsingshan Stainless |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity method investment ownership percentage | 50.00% |  |
Revenue from related parties | $ 0.0 | 18.4 | 14.6
Income (loss) from equity method investments | (0.9) | (10.6) | (19.3)
Allegheny & Tsingshan Stainless | Advanced Alloys & Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (loss) from equity method investments | $ (0.9) | (8.2) | (12.2)
Uniti [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity method investment ownership percentage | 50.00% |  |
Revenue from related parties | $ 45.8 | 36.7 | 31.3
Uniti [Member] | Advanced Alloys & Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (loss) from equity method investments | $ 1.0 | $ 1.2 | 1.5
Aerospace & Defense Market Concentration Risk [Member] | Revenue Benchmark [Member] | High Performance Materials & Components |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of sales | 75.00% |  |
Energy and Aerospace & Defense Market Concentration [Member] | Revenue Benchmark [Member] | Advanced Alloys & Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of sales | 45.00% |  |
Commercial Jet Engines Concentration | Revenue Benchmark [Member] | High Performance Materials & Components |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of sales | 40.00% |  |
Cast Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gain (loss) on sale of businesses |  |  | 6.2
Forged Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gain (loss) on sale of businesses |  |  | $ (13.3)
Allegheny Technologies Inc | STAL Precision Stainless Steel Company Limited [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Joint venture ownership percentage | 60.00% |  |

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