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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 30, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,144.4 | $ 1,042.9
Percent of revenue | 100.00% | 100.00%
Nickel-based Alloys and Specialty Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 48.00% | 45.00%
Precision and Engineered Strip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 5.00% | 8.00%
Precision Forgings, Casting and Components [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 20.00% | 19.00%
Titanium and Titanium-based Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 19.00% | 18.00%
Zirconium and Related Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 8.00% | 10.00%
UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 643.8 | $ 571.6
Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 114.3 | 116.2
Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 260.7 | 262.2
CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 39.8 | 27.6
South America, Middle East, and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 85.8 | 65.3
Aerospace and Defense Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 754.4 | 615.7
Jet Engines- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 421.4 | 311.2
Airframes- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 205.8 | 190.1
Defense [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 127.2 | 114.4
Conventional energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 121.8 | 102.5
Specialty Energy [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 50.5 | 56.1
Automotive Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 60.6 | 56.0
Electronic Devices Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 39.6 | 52.9
Construction Mining Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 32.9 | 27.2
Medical Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 42.4 | 59.1
Other Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 42.2 | 73.4
Other Core Markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 132.5 | 168.1
Core End Markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 886.9 | 783.8
Industrial Markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 257.5 | 259.1
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,261.7 | 1,132.6
Operating Segments | HPMC |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 644.0 | $ 571.9
Percent of revenue | 100.00% | 100.00%
Operating Segments | HPMC | Nickel-based Alloys and Specialty Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 41.00% | 39.00%
Operating Segments | HPMC | Precision and Engineered Strip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 0.00% | 1.00%
Operating Segments | HPMC | Precision Forgings, Casting and Components [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 39.00% | 36.00%
Operating Segments | HPMC | Titanium and Titanium-based Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 20.00% | 24.00%
Operating Segments | HPMC | Zirconium and Related Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 0.00% | 0.00%
Operating Segments | HPMC | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 316.4 | $ 240.7
Operating Segments | HPMC | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 33.3 | 38.9
Operating Segments | HPMC | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 191.3 | 211.5
Operating Segments | HPMC | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 20.1 | 15.3
Operating Segments | HPMC | South America, Middle East, and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 23.0 | 23.5
Operating Segments | HPMC | Aerospace and Defense Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 537.5 | 442.6
Operating Segments | HPMC | Jet Engines- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 397.3 | 296.9
Operating Segments | HPMC | Airframes- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 81.8 | 85.7
Operating Segments | HPMC | Defense [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 58.4 | 60.0
Operating Segments | HPMC | Conventional energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1.7 | 3.5
Operating Segments | HPMC | Specialty Energy [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12.4 | 18.2
Operating Segments | HPMC | Automotive Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1.4 | 5.0
Operating Segments | HPMC | Electronic Devices Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0.0 | 1.0
Operating Segments | HPMC | Construction Mining Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 7.1 | 6.7
Operating Segments | HPMC | Medical Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 15.8 | 35.9
Operating Segments | HPMC | Other Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8.2 | 17.0
Operating Segments | HPMC | Other Core Markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28.2 | 55.1
Operating Segments | HPMC | Core End Markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 565.7 | 497.7
Operating Segments | AA&S |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 617.7 | $ 560.7
Percent of revenue | 100.00% | 100.00%
Operating Segments | AA&S | Nickel-based Alloys and Specialty Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 55.00% | 51.00%
Operating Segments | AA&S | Precision and Engineered Strip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 11.00% | 17.00%
Operating Segments | AA&S | Precision Forgings, Casting and Components [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 0.00% | 0.00%
Operating Segments | AA&S | Titanium and Titanium-based Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 17.00% | 12.00%
Operating Segments | AA&S | Zirconium and Related Alloys [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percent of revenue | 17.00% | 20.00%
Operating Segments | AA&S | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 327.4 | $ 330.9
Operating Segments | AA&S | Asia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 81.0 | 77.3
Operating Segments | AA&S | Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 69.4 | 50.7
Operating Segments | AA&S | CANADA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 19.7 | 12.3
Operating Segments | AA&S | South America, Middle East, and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 62.8 | 41.8
Operating Segments | AA&S | Aerospace and Defense Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 216.9 | 173.1
Operating Segments | AA&S | Jet Engines- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 24.1 | 14.3
Operating Segments | AA&S | Airframes- Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 124.0 | 104.4
Operating Segments | AA&S | Defense [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 68.8 | 54.4
Operating Segments | AA&S | Conventional energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 120.1 | 99.0
Operating Segments | AA&S | Specialty Energy [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 38.1 | 37.9
Operating Segments | AA&S | Automotive Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 59.2 | 51.0
Operating Segments | AA&S | Electronic Devices Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 39.6 | 51.9
Operating Segments | AA&S | Construction Mining Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 25.8 | 20.5
Operating Segments | AA&S | Medical Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 26.6 | 23.2
Operating Segments | AA&S | Other Market [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 34.0 | 56.4
Operating Segments | AA&S | Other Core Markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 104.3 | 113.0
Operating Segments | AA&S | Core End Markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 321.2 | 286.1
Sales to external customers | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,144.4 | 1,042.9
Sales to external customers | Operating Segments | HPMC |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 584.1 | 529.9
Sales to external customers | Operating Segments | AA&S |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 560.3 | 513.0
Industrial Markets | Operating Segments | HPMC |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 18.4 | 32.2
Industrial Markets | Operating Segments | AA&S |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 239.1 | $ 226.9

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