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Business Segments (Details2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Segment Reporting Other Significant Reconciling Item [Line Items]        
Depreciation and amortization: $ 42.6 $ 38.5 $ 125.0 $ 112.4
Capital expenditures:     187.9 191.8
Operating Segments        
Segment Reporting Other Significant Reconciling Item [Line Items]        
Depreciation and amortization: 42.6 38.5 125.0 112.4
Capital expenditures: 62.5 65.8 187.9 191.8
Operating Segments | HPMC        
Segment Reporting Other Significant Reconciling Item [Line Items]        
Depreciation and amortization: 21.2 18.6 61.8 52.8
Capital expenditures: 36.9 32.7 111.5 111.2
Operating Segments | AA&S        
Segment Reporting Other Significant Reconciling Item [Line Items]        
Depreciation and amortization: 19.7 18.2 58.3 54.5
Capital expenditures: 25.2 31.6 74.4 77.1
Operating Segments | Corporate        
Segment Reporting Other Significant Reconciling Item [Line Items]        
Depreciation and amortization: 1.7 1.7 4.9 5.1
Capital expenditures: $ 0.4 $ 1.5 $ 2.0 $ 3.5