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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue $ 1,046.0 $ 959.5 $ 2,084.1 $ 1,793.6
Percent of revenue 100.00% 100.00% 100.00% 100.00%
Nickel-based Alloys and Specialty Alloys [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 52.00% 52.00% 52.00% 51.00%
Precision and Engineered Strip [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 9.00% 14.00% 10.00% 15.00%
Precision Forgings, Casting and Components [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 17.00% 15.00% 16.00% 15.00%
Titanium and Titanium-based Alloys [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 14.00% 11.00% 14.00% 10.00%
Zirconium and Related Alloys [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 8.00% 8.00% 8.00% 9.00%
UNITED STATES        
Disaggregation of Revenue [Line Items]        
Revenue $ 568.3 $ 568.6 $ 1,156.6 $ 1,046.3
Asia [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 154.5 154.9 308.0 314.2
Europe [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 251.4 183.8 490.0 343.7
CANADA        
Disaggregation of Revenue [Line Items]        
Revenue 29.9 24.4 53.1 43.4
South America, Middle East, and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 41.9 27.8 76.4 46.0
Aerospace and Defense Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 606.8 436.4 1,182.5 803.2
Jet Engines- Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 340.9 248.7 651.8 445.3
Airframes- Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 164.2 106.1 334.1 199.8
Defense [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 101.7 81.6 196.6 158.1
Energy        
Disaggregation of Revenue [Line Items]        
Revenue 179.5 200.3 389.7 360.0
Oil & Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 111.3 125.2 238.8 228.3
Specialty Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 68.2 75.1 150.9 131.7
Automotive Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 52.8 75.5 112.2 166.5
Electronic Devices Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 36.0 49.4 70.4 101.0
Construction Mining Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 48.4 39.9 88.8 91.9
Food Equipment and Appliances Market        
Disaggregation of Revenue [Line Items]        
Revenue 20.9 62.7 42.4 96.7
Medical Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 41.9 39.5 76.9 75.7
Other Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 59.7 55.8 121.2 98.6
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 1,176.2 1,062.9 2,331.6 1,979.3
Operating Segments | High Performance Materials & Components        
Disaggregation of Revenue [Line Items]        
Revenue $ 562.8 $ 439.8 $ 1,092.4 $ 820.6
Percent of revenue 100.00% 100.00% 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 49.00% 48.00% 47.00% 48.00%
Operating Segments | High Performance Materials & Components | Precision and Engineered Strip [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 1.00% 0.00% 1.00% 0.00%
Operating Segments | High Performance Materials & Components | Precision Forgings, Casting and Components [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 33.00% 35.00% 33.00% 35.00%
Operating Segments | High Performance Materials & Components | Titanium and Titanium-based Alloys [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 17.00% 17.00% 19.00% 17.00%
Operating Segments | High Performance Materials & Components | Zirconium and Related Alloys [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 $ 222.0 $ 179.8 $ 418.5 $ 336.2
Operating Segments | High Performance Materials & Components | Asia [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 51.0 50.5 95.0 94.7
Operating Segments | High Performance Materials & Components | Europe [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 207.8 135.0 402.0 256.3
Operating Segments | High Performance Materials & Components | CANADA        
Disaggregation of Revenue [Line Items]        
Revenue 16.6 12.7 28.6 23.0
Operating Segments | High Performance Materials & Components | South America, Middle East, and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 29.7 18.1 54.1 27.5
Operating Segments | High Performance Materials & Components | Aerospace and Defense Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 436.2 316.0 831.6 573.6
Operating Segments | High Performance Materials & Components | Jet Engines- Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 319.2 231.4 601.7 410.4
Operating Segments | High Performance Materials & Components | Airframes- Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 67.0 43.9 138.0 81.1
Operating Segments | High Performance Materials & Components | Defense [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 50.0 40.7 91.9 82.1
Operating Segments | High Performance Materials & Components | Energy        
Disaggregation of Revenue [Line Items]        
Revenue 33.6 39.6 60.9 86.8
Operating Segments | High Performance Materials & Components | Oil & Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 3.7 8.1 6.1 25.2
Operating Segments | High Performance Materials & Components | Specialty Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 29.9 31.5 54.8 61.6
Operating Segments | High Performance Materials & Components | Automotive Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 6.0 2.3 12.3 5.2
Operating Segments | High Performance Materials & Components | Electronic Devices Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 0.7 0.7 1.2 1.2
Operating Segments | High Performance Materials & Components | Construction Mining Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 11.0 7.9 19.2 16.3
Operating Segments | High Performance Materials & Components | Food Equipment and Appliances Market        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Operating Segments | High Performance Materials & Components | Medical Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 24.3 16.8 41.8 30.0
Operating Segments | High Performance Materials & Components | Other Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 15.3 12.8 31.2 24.6
Operating Segments | Advanced Alloys & Solutions        
Disaggregation of Revenue [Line Items]        
Revenue $ 613.4 $ 623.1 $ 1,239.2 $ 1,158.7
Percent of revenue 100.00% 100.00% 100.00% 100.00%
Operating Segments | Advanced Alloys & Solutions | Nickel-based Alloys and Specialty Alloys [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 55.00% 55.00% 57.00% 54.00%
Operating Segments | Advanced Alloys & Solutions | Precision and Engineered Strip [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 18.00% 24.00% 18.00% 26.00%
Operating Segments | Advanced Alloys & Solutions | Precision Forgings, Casting and Components [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 0.00% 0.00% 0.00% 0.00%
Operating Segments | Advanced Alloys & Solutions | Titanium and Titanium-based Alloys [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 11.00% 6.00% 10.00% 6.00%
Operating Segments | Advanced Alloys & Solutions | Zirconium and Related Alloys [Member]        
Disaggregation of Revenue [Line Items]        
Percent of revenue 16.00% 15.00% 15.00% 14.00%
Operating Segments | Advanced Alloys & Solutions | UNITED STATES        
Disaggregation of Revenue [Line Items]        
Revenue $ 346.3 $ 388.8 $ 738.1 $ 710.1
Operating Segments | Advanced Alloys & Solutions | Asia [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 103.5 104.4 213.0 219.5
Operating Segments | Advanced Alloys & Solutions | Europe [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 43.6 48.8 88.0 87.4
Operating Segments | Advanced Alloys & Solutions | CANADA        
Disaggregation of Revenue [Line Items]        
Revenue 13.3 11.7 24.5 20.4
Operating Segments | Advanced Alloys & Solutions | South America, Middle East, and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 12.2 9.7 22.3 18.5
Operating Segments | Advanced Alloys & Solutions | Aerospace and Defense Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 170.6 120.4 350.9 229.6
Operating Segments | Advanced Alloys & Solutions | Jet Engines- Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 21.7 17.3 50.1 34.9
Operating Segments | Advanced Alloys & Solutions | Airframes- Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 97.2 62.2 196.1 118.7
Operating Segments | Advanced Alloys & Solutions | Defense [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 51.7 40.9 104.7 76.0
Operating Segments | Advanced Alloys & Solutions | Energy        
Disaggregation of Revenue [Line Items]        
Revenue 145.9 160.7 328.8 273.2
Operating Segments | Advanced Alloys & Solutions | Oil & Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 107.6 117.1 232.7 203.1
Operating Segments | Advanced Alloys & Solutions | Specialty Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 38.3 43.6 96.1 70.1
Operating Segments | Advanced Alloys & Solutions | Automotive Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 46.8 73.2 99.9 161.3
Operating Segments | Advanced Alloys & Solutions | Electronic Devices Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 35.3 48.7 69.2 99.8
Operating Segments | Advanced Alloys & Solutions | Construction Mining Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 37.4 32.0 69.6 75.6
Operating Segments | Advanced Alloys & Solutions | Food Equipment and Appliances Market        
Disaggregation of Revenue [Line Items]        
Revenue 20.9 62.7 42.4 96.7
Operating Segments | Advanced Alloys & Solutions | Medical Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 17.6 22.7 35.1 45.7
Operating Segments | Advanced Alloys & Solutions | Other Market [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 44.4 43.0 90.0 74.0
External Customers | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 1,046.0 959.5 2,084.1 1,793.6
External Customers | Operating Segments | High Performance Materials & Components        
Disaggregation of Revenue [Line Items]        
Revenue 527.1 396.1 998.2 737.7
External Customers | Operating Segments | Advanced Alloys & Solutions        
Disaggregation of Revenue [Line Items]        
Revenue $ 518.9 $ 563.4 $ 1,085.9 $ 1,055.9