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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 598.0 | $ 1,018.7 | $ 2,323.8 | $ 3,103.9
Percent of revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Total High-Value Products |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 84.00% | 85.00% | 84.00% | 85.00%
Nickel-based alloys and specialty alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 28.00% | 33.00% | 30.00% | 32.00%
Precision forgings, castings and components |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 11.00% | 16.00% | 14.00% | 18.00%
Titanium and titanium-based alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 17.00% | 19.00% | 18.00% | 18.00%
Precision rolled strip products |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 18.00% | 12.00% | 13.00% | 11.00%
Zirconium and related alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 10.00% | 5.00% | 9.00% | 6.00%
Standard stainless products [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 16.00% | 15.00% | 16.00% | 15.00%
United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 348.6 | $ 605.4 | $ 1,431.9 | $ 1,867.0
Europe |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 94.8 | 186.3 | 390.3 | 604.5
Asia |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 122.9 | 164.5 | 360.9 | 459.6
Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 12.9 | 25.6 | 51.1 | 81.4
South America, Middle East and other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 18.8 | 36.9 | 89.6 | 91.4
Aerospace & Defense |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 246.1 | 503.5 | 1,104.2 | 1,601.3
Energy* |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | [1] | 130.4 | 217.2 | 468.5 | 599.1
Automotive |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 59.4 | 73.6 | 186.7 | 224.1
Electronics/Computers/Communications |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 45.9 | 44.5 | 118.6 | 116.7
Construction/Mining |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 28.3 | 43.7 | 106.7 | 154.2
Food Equipment & Appliances |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 33.8 | 53.6 | 131.4 | 156.4
Medical |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 27.3 | 41.0 | 95.8 | 129.5
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 26.8 | 41.6 | 111.9 | 122.6
Operating Segments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 623.4 | 1,097.8 | 2,482.4 | 3,351.9
Operating Segments | High Performance Materials & Components |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 230.1 | $ 471.6 | $ 995.3 | $ 1,540.7
Percent of revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Operating Segments | High Performance Materials & Components | Total High-Value Products |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Operating Segments | High Performance Materials & Components | Nickel-based alloys and specialty alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 38.00% | 38.00% | 38.00% | 37.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 30.00% | 35.00% | 35.00% | 38.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 32.00% | 27.00% | 27.00% | 25.00%
Operating Segments | High Performance Materials & Components | Precision rolled strip products |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 0.00% | 0.00% | 0.00% | 0.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 0.00% | 0.00% | 0.00% | 0.00%
Operating Segments | High Performance Materials & Components | Standard stainless products [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 0.00% | 0.00% | 0.00% | 0.00%
Operating Segments | High Performance Materials & Components | United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 129.3 | $ 241.1 | $ 522.8 | $ 800.3
Operating Segments | High Performance Materials & Components | Europe |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 60.7 | 134.5 | 286.2 | 454.0
Operating Segments | High Performance Materials & Components | Asia |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 19.9 | 44.1 | 72.6 | 136.2
Operating Segments | High Performance Materials & Components | Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 4.4 | 12.6 | 21.1 | 38.9
Operating Segments | High Performance Materials & Components | South America, Middle East and other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 7.0 | 19.5 | 39.6 | 52.1
Operating Segments | High Performance Materials & Components | Aerospace & Defense |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 171.8 | 377.7 | 782.9 | 1,223.1
Operating Segments | High Performance Materials & Components | Energy* |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | [1] | 24.4 | 36.2 | 71.3 | 97.7
Operating Segments | High Performance Materials & Components | Automotive |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 1.5 | 2.2 | 4.5 | 8.9
Operating Segments | High Performance Materials & Components | Electronics/Computers/Communications |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 0.2 | 0.1 | 0.7 | 0.4
Operating Segments | High Performance Materials & Components | Construction/Mining |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 4.0 | 5.4 | 14.3 | 37.3
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 0.0 | 0.1 | 0.1 | 0.2
Operating Segments | High Performance Materials & Components | Medical |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 10.6 | 18.9 | 37.9 | 64.7
Operating Segments | High Performance Materials & Components | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 8.8 | 11.2 | 30.6 | 49.2
Operating Segments | Advanced Alloys & Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 393.3 | $ 626.2 | $ 1,487.1 | $ 1,811.2
Percent of revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Total High-Value Products |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 74.00% | 73.00% | 71.00% | 71.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Nickel-based alloys and specialty alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 22.00% | 29.00% | 25.00% | 26.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision forgings, castings and components |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 0.00% | 0.00% | 0.00% | 0.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Titanium and titanium-based alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 8.00% | 13.00% | 12.00% | 11.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision rolled strip products |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 28.00% | 22.00% | 21.00% | 22.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Zirconium and related alloys |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 16.00% | 9.00% | 13.00% | 12.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Standard stainless products [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  | 26.00% | 27.00% | 29.00% | 29.00%
Operating Segments | Advanced Alloys & Solutions [Member] | United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 219.3 | $ 364.3 | $ 909.1 | $ 1,066.7
Operating Segments | Advanced Alloys & Solutions [Member] | Europe |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 34.1 | 51.8 | 104.1 | 150.5
Operating Segments | Advanced Alloys & Solutions [Member] | Asia |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 103.0 | 120.4 | 288.3 | 323.4
Operating Segments | Advanced Alloys & Solutions [Member] | Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 8.5 | 13.0 | 30.0 | 42.5
Operating Segments | Advanced Alloys & Solutions [Member] | South America, Middle East and other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 11.8 | 17.4 | 50.0 | 39.3
Operating Segments | Advanced Alloys & Solutions [Member] | Aerospace & Defense |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 74.3 | 125.8 | 321.3 | 378.2
Operating Segments | Advanced Alloys & Solutions [Member] | Energy* |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | [1] | 106.0 | 181.0 | 397.2 | 501.4
Operating Segments | Advanced Alloys & Solutions [Member] | Automotive |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 57.9 | 71.4 | 182.2 | 215.2
Operating Segments | Advanced Alloys & Solutions [Member] | Electronics/Computers/Communications |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 45.7 | 44.4 | 117.9 | 116.3
Operating Segments | Advanced Alloys & Solutions [Member] | Construction/Mining |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 24.3 | 38.3 | 92.4 | 116.9
Operating Segments | Advanced Alloys & Solutions [Member] | Food Equipment & Appliances |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 33.8 | 53.5 | 131.3 | 156.2
Operating Segments | Advanced Alloys & Solutions [Member] | Medical |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 16.7 | 22.1 | 57.9 | 64.8
Operating Segments | Advanced Alloys & Solutions [Member] | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 18.0 | 30.4 | 81.3 | 73.4
External Customers | Operating Segments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 598.0 | 1,018.7 | 2,323.8 | 3,103.9
External Customers | Operating Segments | High Performance Materials & Components |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 221.3 | 451.8 | 942.3 | 1,481.5
External Customers | Operating Segments | Advanced Alloys & Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 376.7 | $ 566.9 | $ 1,381.5 | $ 1,622.4
[1] | Includes the oil & gas, hydrocarbon and chemical processing, and electrical energy markets.

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