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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 3,836.0 | $ 2,799.8 | $ 2,982.1
Percent of total revenue | 100.00% | 100.00% | 100.00%
Nickel-based alloys and specialty alloys |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 52.00% | 43.00% | 45.00%
Precision Forgings, Casting and Components [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 15.00% | 16.00% | 14.00%
Titanium and Titanium-based Alloys [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 11.00% | 12.00% | 17.00%
Zirconium and related alloys |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 8.00% | 10.00% | 9.00%
Precision rolled strip |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 14.00% | 19.00% | 15.00%
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,218.6 | $ 1,534.9 | $ 1,809.1
China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 351.8 | 370.4 | 315.5
Germany |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 200.9 | 121.3 | 125.4
UNITED KINGDOM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 217.7 | 153.9 | 126.5
Rest of World |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 602.4 | 484.9 | 451.8
France |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 157.2 | 58.5 | 84.9
CANADA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 87.4 | 75.9 | 68.9
Total Aerospace & Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,873.6 | 1,132.7 | 1,360.0
Total Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 753.3 | 591.9 | 618.9
Automotive |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 302.1 | 305.1 | 263.2
Food Equipment & Appliances |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 158.5 | 153.1 | 159.2
Construction/Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 176.4 | 122.2 | 142.0
Medical Market [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 163.1 | 131.5 | 119.1
Electronic Devices Market [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 200.0 | 215.1 | 177.7
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 209.0 | 148.2 | 142.0
Jet Engines- Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,063.5 | 517.2 | 600.9
Airframes- Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 468.9 | 262.7 | 410.8
Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 341.2 | 352.8 | 348.3
Oil & Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 476.7 | 332.3 | 365.8
Specialty Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 276.6 | 259.6 | 253.1
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 4,249.4 | 3,010.7 | 3,182.9
Operating Segments | High Performance Materials & Components |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,815.7 | $ 1,248.3 | $ 1,235.4
Percent of total revenue | 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 total revenue | 49.00% | 43.00% | 38.00%
Operating Segments | High Performance Materials & Components | Precision Forgings, Casting and Components [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 34.00% | 38.00% | 34.00%
Operating Segments | High Performance Materials & Components | Titanium and Titanium-based Alloys [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 17.00% | 19.00% | 28.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 0.00% | 0.00% | 0.00%
Operating Segments | High Performance Materials & Components | Precision rolled strip |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 0.00% | 0.00% | 0.00%
Operating Segments | High Performance Materials & Components | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 742.9 | $ 571.3 | $ 641.0
Operating Segments | High Performance Materials & Components | China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 59.8 | 49.5 | 31.0
Operating Segments | High Performance Materials & Components | Germany |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 148.4 | 74.1 | 76.6
Operating Segments | High Performance Materials & Components | UNITED KINGDOM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 165.7 | 136.7 | 101.9
Operating Segments | High Performance Materials & Components | Rest of World |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 352.5 | 238.5 | 219.3
Operating Segments | High Performance Materials & Components | France |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 125.7 | 48.7 | 66.5
Operating Segments | High Performance Materials & Components | CANADA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 46.2 | 36.3 | 28.3
Operating Segments | High Performance Materials & Components | Total Aerospace & Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,318.0 | 835.5 | 946.9
Operating Segments | High Performance Materials & Components | Total Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 148.6 | 178.3 | 106.2
Operating Segments | High Performance Materials & Components | Automotive |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 11.2 | 8.7 | 5.5
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0.2 | 0.1 | 0.0
Operating Segments | High Performance Materials & Components | Construction/Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 34.1 | 24.0 | 18.6
Operating Segments | High Performance Materials & Components | Medical Market [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 73.2 | 60.3 | 47.7
Operating Segments | High Performance Materials & Components | Electronic Devices Market [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2.4 | 1.2 | 0.9
Operating Segments | High Performance Materials & Components | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 53.5 | 47.0 | 38.8
Operating Segments | High Performance Materials & Components | Jet Engines- Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 975.7 | 480.9 | 542.7
Operating Segments | High Performance Materials & Components | Airframes- Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 184.1 | 132.8 | 219.8
Operating Segments | High Performance Materials & Components | Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 158.2 | 221.8 | 184.4
Operating Segments | High Performance Materials & Components | Oil & Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 35.0 | 42.2 | 37.3
Operating Segments | High Performance Materials & Components | Specialty Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 113.6 | 136.1 | 68.9
Operating Segments | Advanced Alloys & Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,433.7 | $ 1,762.4 | $ 1,947.5
Percent of total revenue | 100.00% | 100.00% | 100.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Nickel-based alloys and specialty alloys |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 54.00% | 44.00% | 49.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision Forgings, Casting and Components [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 0.00% | 0.00% | 0.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Titanium and Titanium-based Alloys [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 7.00% | 6.00% | 11.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Zirconium and related alloys |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 14.00% | 17.00% | 15.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision rolled strip |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of total revenue | 25.00% | 33.00% | 25.00%
Operating Segments | Advanced Alloys & Solutions [Member] | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,475.7 | $ 963.6 | $ 1,168.1
Operating Segments | Advanced Alloys & Solutions [Member] | China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 292.0 | 320.9 | 284.5
Operating Segments | Advanced Alloys & Solutions [Member] | Germany |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 52.5 | 47.2 | 48.8
Operating Segments | Advanced Alloys & Solutions [Member] | UNITED KINGDOM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 52.0 | 17.2 | 24.6
Operating Segments | Advanced Alloys & Solutions [Member] | Rest of World |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 249.9 | 246.4 | 232.5
Operating Segments | Advanced Alloys & Solutions [Member] | France |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 31.5 | 9.8 | 18.4
Operating Segments | Advanced Alloys & Solutions [Member] | CANADA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 41.2 | 39.6 | 40.6
Operating Segments | Advanced Alloys & Solutions [Member] | Total Aerospace & Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 555.6 | 297.2 | 413.1
Operating Segments | Advanced Alloys & Solutions [Member] | Total Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 604.7 | 413.6 | 512.7
Operating Segments | Advanced Alloys & Solutions [Member] | Automotive |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 290.9 | 296.4 | 257.7
Operating Segments | Advanced Alloys & Solutions [Member] | Food Equipment & Appliances |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 158.3 | 153.0 | 159.2
Operating Segments | Advanced Alloys & Solutions [Member] | Construction/Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 142.3 | 98.2 | 123.4
Operating Segments | Advanced Alloys & Solutions [Member] | Medical Market [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 89.9 | 71.2 | 71.4
Operating Segments | Advanced Alloys & Solutions [Member] | Electronic Devices Market [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 197.6 | 213.9 | 176.8
Operating Segments | Advanced Alloys & Solutions [Member] | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 155.5 | 101.2 | 103.2
Operating Segments | Advanced Alloys & Solutions [Member] | Jet Engines- Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 87.8 | 36.3 | 58.2
Operating Segments | Advanced Alloys & Solutions [Member] | Airframes- Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 284.8 | 129.9 | 191.0
Operating Segments | Advanced Alloys & Solutions [Member] | Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 183.0 | 131.0 | 163.9
Operating Segments | Advanced Alloys & Solutions [Member] | Oil & Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 441.7 | 290.1 | 328.5
Operating Segments | Advanced Alloys & Solutions [Member] | Specialty Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 163.0 | 123.5 | 184.2
External Customers | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,836.0 | 2,799.8 | 2,982.1
External Customers | Operating Segments | High Performance Materials & Components |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,641.2 | 1,155.1 | 1,164.6
External Customers | Operating Segments | Advanced Alloys & Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,194.8 | $ 1,644.7 | $ 1,817.5

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