v3.26.1
Segment Information, Geographic and Product Data - Summary of Results of Operation, Depreciation and Amortization, Capital Expenditures and Total Assets by Reportable Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting [Line Items]      
Consolidated depreciation and amortization $ 147.1 $ 139.2 $ 134.6
Consolidated capital expenditures 242.7 154.3 96.6
Consolidated total assets 3,838.3 3,486.8  
Operating      
Segment Reporting [Line Items]      
Consolidated total assets 3,362.3 3,062.8  
Corporate      
Segment Reporting [Line Items]      
Consolidated depreciation and amortization 5.1 5.4 5.0
Consolidated capital expenditures 4.2 3.4 3.4
Consolidated total assets 491.0 433.2  
Intersegment      
Segment Reporting [Line Items]      
Consolidated total assets (15.0) (9.2)  
Specialty Alloys Operations | Operating      
Segment Reporting [Line Items]      
Consolidated depreciation and amortization 124.3 117.3 113.3
Consolidated capital expenditures 226.1 135.9 80.0
Consolidated total assets 2,962.0 2,649.3  
Performance Engineered Products | Operating      
Segment Reporting [Line Items]      
Consolidated depreciation and amortization 17.7 16.5 16.3
Consolidated capital expenditures 12.4 15.0 $ 13.2
Consolidated total assets $ 400.3 $ 413.5