Business Segments (Details2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 146.1	$ 142.9	$ 143.9
Capital expenditures	200.7	130.9	152.6
Operating Segments
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	146.1	142.9	143.9
Capital expenditures	200.7	130.9	152.6
Operating Segments | High Performance Materials & Components
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	71.1	68.3	75.0
Capital expenditures	100.4	33.3	40.2
Operating Segments | Corporate [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	7.1	7.2	4.4
Capital expenditures	3.1	8.0	1.8
Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	67.9	67.4	64.5
Capital expenditures	$ 97.2	$ 89.6	$ 110.6