Business Segments (Details2) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 151.5	$ 146.1	$ 142.9
Capital expenditures	239.1	200.7	130.9
Operating Segments
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	151.5	146.1	142.9
Capital expenditures	239.1	200.7	130.9
Operating Segments | HPMC
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	71.6	71.1	68.3
Capital expenditures	132.0	100.4	33.3
Operating Segments | AA&S
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	73.2	67.9	67.4
Capital expenditures	103.6	97.2	89.6
Operating Segments | Corporate [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	6.7	7.1	7.2
Capital expenditures	$ 3.5	$ 3.1	$ 8.0