Business Segments (Details2) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2025	Mar. 31, 2024
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	$ 40.8	$ 36.0
Capital expenditures:	53.3	65.8
Operating Segments
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	40.8	36.0
Capital expenditures:	53.3	65.8
Operating Segments | HPMC
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	19.7	16.3
Capital expenditures:	29.4	41.7
Operating Segments | AA&S
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	19.5	18.0
Capital expenditures:	23.0	23.6
Operating Segments | Corporate
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	1.6	1.7
Capital expenditures:	$ 0.9	$ 0.5