Business Segments (Details2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	$ 41.6	$ 37.9	$ 82.4	$ 73.9
Capital expenditures:			125.4	126.0
Operating Segments
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	41.6	37.9	82.4	73.9
Capital expenditures:	72.1	60.2	125.4	126.0
Operating Segments | HPMC
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	20.9	17.9	40.6	34.2
Capital expenditures:	45.2	36.8	74.6	78.5
Operating Segments | AA&S
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	19.1	18.3	38.6	36.3
Capital expenditures:	26.2	21.9	49.2	45.5
Operating Segments | Corporate
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization:	1.6	1.7	3.2	3.4
Capital expenditures:	$ 0.7	$ 1.5	$ 1.6	$ 2.0