Business Segments - Schedule of Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 168.1	$ 151.5	$ 146.1
Capital expenditures	280.6	239.1	200.7
Operating Segments
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	168.1	151.5	146.1
Capital expenditures	280.6	239.1	200.7
Operating Segments | HPMC
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	84.2	71.6	71.1
Capital expenditures	157.4	132.0	100.4
Operating Segments | AA&S
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	77.4	73.2	67.9
Capital expenditures	117.9	103.6	97.2
Operating Segments | Other
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	6.5	6.7	7.1
Capital expenditures	$ 5.3	$ 3.5	$ 3.1