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Revenue - Summary of Revenues by End-Use Markets and Geography (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |
Total net sales | $ 717.6 | $ 651.9
Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (28.3) | (20.0)
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 421.1 | 393.3
United States | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (10.9) | (5.7)
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 140.3 | 107.4
Europe | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (5.8) | (4.3)
Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 94.4 | 103.0
Asia Pacific | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (11.7) | (10.1)
Mexico |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 36.9 | 24.2
Mexico | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 0.0 | 0.0
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 14.3 | 13.7
Canada | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 0.0 | (0.1)
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 10.6 | 10.3
Other | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 0.1 | 0.2
Aerospace and Defense |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 437.4 | 352.5
Aerospace and Defense | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (4.5) | (5.0)
Medical |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 86.9 | 80.0
Medical | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (16.0) | (11.0)
Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 52.5 | 44.7
Energy | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 0.0 | 0.0
Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 28.3 | 42.0
Transportation | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 0.0 | 0.0
Industrial and Consumer |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 91.2 | 105.0
Industrial and Consumer | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (7.7) | (4.0)
Distribution |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 21.3 | 27.7
Distribution | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | (0.1) | 0.0
Specialty Alloys Operations | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 645.1 | 570.1
Specialty Alloys Operations | United States | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 373.7 | 340.7
Specialty Alloys Operations | Europe | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 129.8 | 94.9
Specialty Alloys Operations | Asia Pacific | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 94.4 | 102.7
Specialty Alloys Operations | Mexico | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 29.1 | 14.4
Specialty Alloys Operations | Canada | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 10.5 | 9.3
Specialty Alloys Operations | Other | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 7.6 | 8.1
Specialty Alloys Operations | Aerospace and Defense | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 417.9 | 332.2
Specialty Alloys Operations | Medical | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 61.1 | 55.3
Specialty Alloys Operations | Energy | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 51.6 | 43.2
Specialty Alloys Operations | Transportation | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 26.4 | 40.1
Specialty Alloys Operations | Industrial and Consumer | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 88.1 | 99.3
Specialty Alloys Operations | Distribution | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 0.0 | 0.0
Performance Engineered Products | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 100.8 | 101.8
Performance Engineered Products | United States | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 58.3 | 58.3
Performance Engineered Products | Europe | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 16.3 | 16.8
Performance Engineered Products | Asia Pacific | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 11.7 | 10.4
Performance Engineered Products | Mexico | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 7.8 | 9.8
Performance Engineered Products | Canada | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 3.8 | 4.5
Performance Engineered Products | Other | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 2.9 | 2.0
Performance Engineered Products | Aerospace and Defense | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 24.0 | 25.3
Performance Engineered Products | Medical | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 41.8 | 35.7
Performance Engineered Products | Energy | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 0.9 | 1.5
Performance Engineered Products | Transportation | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 1.9 | 1.9
Performance Engineered Products | Industrial and Consumer | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 10.8 | 9.7
Performance Engineered Products | Distribution | Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | $ 21.4 | $ 27.7

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