Derivative Financial Instruments and Hedging - Schedule of Derivative Financial Instruments (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	Jun. 28, 2026	Dec. 28, 2025
Derivatives Fair Value [Line Items]
Total asset derivatives	$ 1.0	$ 1.8
Total liability derivatives	5.2	1.8
Natural gas contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives Fair Value [Line Items]
Total asset derivatives	0.4	1.0
Natural gas contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives Fair Value [Line Items]
Total asset derivatives	0.2	0.1
Natural gas contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Derivatives Fair Value [Line Items]
Total liability derivatives	2.3	1.3
Natural gas contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives Fair Value [Line Items]
Total liability derivatives	0.2	0.4
Nickel and other raw material contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives Fair Value [Line Items]
Total asset derivatives	0.2	0.6
Nickel and other raw material contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Derivatives Fair Value [Line Items]
Total liability derivatives	2.5	0.1
Nickel and other raw material contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives Fair Value [Line Items]
Total liability derivatives	0.2	0.0
Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives Fair Value [Line Items]
Total asset derivatives	$ 0.2	$ 0.1