v3.26.3
Business Segments - Schedule of Results of Operation, Depreciation and Amortization, Capital Expenditures and Total Assets by Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Segment Reporting [Line Items]      
Consolidated depreciation and amortization $ 36.6 $ 36.0  
Consolidated capital expenditures 77.7 42.6  
Consolidated total assets 3,744.7   $ 3,838.3
Operating      
Segment Reporting [Line Items]      
Consolidated total assets 3,493.8   3,362.3
Corporate      
Segment Reporting [Line Items]      
Consolidated depreciation and amortization 1.2 1.2  
Consolidated capital expenditures 0.8 0.7  
Consolidated total assets 261.5   491.0
Intersegment      
Segment Reporting [Line Items]      
Consolidated total assets (10.6)   (15.0)
Specialty Alloys Operations | Operating      
Segment Reporting [Line Items]      
Consolidated depreciation and amortization 30.7 30.4  
Consolidated capital expenditures 74.4 38.9  
Consolidated total assets 3,095.5   2,962.0
Performance Engineered Products | Operating      
Segment Reporting [Line Items]      
Consolidated depreciation and amortization 4.7 4.4  
Consolidated capital expenditures 2.5 $ 3.0  
Consolidated total assets $ 398.3   $ 400.3