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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Apr. 02, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,042.9 | $ 1,038.1
Percent of revenue | 100.00% | 100.00%
Nickel-based Alloys and Specialty Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 45.00% | 53.00%
Precision and Engineered Strip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 8.00% | 10.00%
Precision Forgings, Casting and Components [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 19.00% | 16.00%
Titanium and Titanium-based Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 18.00% | 14.00%
Zirconium and Related Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 10.00% | 7.00%
UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 571.6 | $ 588.3
Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 116.2 | 153.5
Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 262.2 | 238.6
CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 27.6 | 23.2
South America, Middle East, and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 65.3 | 34.5
Aerospace and Defense Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 615.7 | 575.7
Jet Engines- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 311.2 | 310.9
Airframes- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 190.1 | 169.9
Defense [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 114.4 | 94.9
Energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 158.6 | 210.2
Oil & Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 102.5 | 127.5
Specialty Energy [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 56.1 | 82.7
Automotive Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 56.0 | 59.4
Electronic Devices Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 52.9 | 34.4
Construction Mining Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 27.2 | 40.4
Food Equipment and Appliances Market |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11.9 | 21.5
Medical Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 59.1 | 35.0
Other Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 61.5 | 61.5
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,132.6 | 1,155.4
Operating Segments | High Performance Materials & Components |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 571.9 | $ 529.6
Percent of revenue | 100.00% | 100.00%
Operating Segments | High Performance Materials & Components | Nickel-based Alloys and Specialty Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 39.00% | 45.00%
Operating Segments | High Performance Materials & Components | Precision and Engineered Strip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 1.00% | 1.00%
Operating Segments | High Performance Materials & Components | Precision Forgings, Casting and Components [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 36.00% | 34.00%
Operating Segments | High Performance Materials & Components | Titanium and Titanium-based Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 24.00% | 20.00%
Operating Segments | High Performance Materials & Components | Zirconium and Related Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 0.00% | 0.00%
Operating Segments | High Performance Materials & Components | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 240.7 | $ 196.5
Operating Segments | High Performance Materials & Components | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 38.9 | 44.0
Operating Segments | High Performance Materials & Components | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 211.5 | 194.2
Operating Segments | High Performance Materials & Components | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 15.3 | 12.0
Operating Segments | High Performance Materials & Components | South America, Middle East, and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 23.5 | 24.4
Operating Segments | High Performance Materials & Components | Aerospace and Defense Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 442.6 | 395.4
Operating Segments | High Performance Materials & Components | Jet Engines- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 296.9 | 282.5
Operating Segments | High Performance Materials & Components | Airframes- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 85.7 | 71.0
Operating Segments | High Performance Materials & Components | Defense [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 60.0 | 41.9
Operating Segments | High Performance Materials & Components | Energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 21.7 | 27.3
Operating Segments | High Performance Materials & Components | Oil & Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3.5 | 2.4
Operating Segments | High Performance Materials & Components | Specialty Energy [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 18.2 | 24.9
Operating Segments | High Performance Materials & Components | Automotive Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 5.0 | 6.3
Operating Segments | High Performance Materials & Components | Electronic Devices Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1.0 | 0.5
Operating Segments | High Performance Materials & Components | Construction Mining Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6.7 | 8.2
Operating Segments | High Performance Materials & Components | Food Equipment and Appliances Market |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0.0 | 0.0
Operating Segments | High Performance Materials & Components | Medical Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 35.9 | 17.5
Operating Segments | High Performance Materials & Components | Other Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17.0 | 15.9
Operating Segments | Advanced Alloys & Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 560.7 | $ 625.8
Percent of revenue | 100.00% | 100.00%
Operating Segments | Advanced Alloys & Solutions | Nickel-based Alloys and Specialty Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 51.00% | 60.00%
Operating Segments | Advanced Alloys & Solutions | Precision and Engineered Strip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 17.00% | 19.00%
Operating Segments | Advanced Alloys & Solutions | Precision Forgings, Casting and Components [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 0.00% | 0.00%
Operating Segments | Advanced Alloys & Solutions | Titanium and Titanium-based Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 12.00% | 8.00%
Operating Segments | Advanced Alloys & Solutions | Zirconium and Related Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 20.00% | 13.00%
Operating Segments | Advanced Alloys & Solutions | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 330.9 | $ 391.8
Operating Segments | Advanced Alloys & Solutions | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 77.3 | 109.5
Operating Segments | Advanced Alloys & Solutions | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 50.7 | 44.4
Operating Segments | Advanced Alloys & Solutions | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12.3 | 11.2
Operating Segments | Advanced Alloys & Solutions | South America, Middle East, and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 41.8 | 10.1
Operating Segments | Advanced Alloys & Solutions | Aerospace and Defense Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 173.1 | 180.3
Operating Segments | Advanced Alloys & Solutions | Jet Engines- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 14.3 | 28.4
Operating Segments | Advanced Alloys & Solutions | Airframes- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 104.4 | 98.9
Operating Segments | Advanced Alloys & Solutions | Defense [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 54.4 | 53.0
Operating Segments | Advanced Alloys & Solutions | Energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 136.9 | 182.9
Operating Segments | Advanced Alloys & Solutions | Oil & Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 99.0 | 125.1
Operating Segments | Advanced Alloys & Solutions | Specialty Energy [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 37.9 | 57.8
Operating Segments | Advanced Alloys & Solutions | Automotive Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 51.0 | 53.1
Operating Segments | Advanced Alloys & Solutions | Electronic Devices Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 51.9 | 33.9
Operating Segments | Advanced Alloys & Solutions | Construction Mining Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 20.5 | 32.2
Operating Segments | Advanced Alloys & Solutions | Food Equipment and Appliances Market |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11.9 | 21.5
Operating Segments | Advanced Alloys & Solutions | Medical Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 23.2 | 17.5
Operating Segments | Advanced Alloys & Solutions | Other Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 44.5 | 45.6
External Customers | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,042.9 | 1,038.1
External Customers | Operating Segments | High Performance Materials & Components |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 529.9 | 471.1
External Customers | Operating Segments | Advanced Alloys & Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 513.0 | $ 567.0

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