Goodwill and Other Intangible Assets - Narrative (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 28, 2025 USD ($)	Dec. 28, 2025 USD ($)	Dec. 29, 2024 USD ($)	Dec. 31, 2023 USD ($)
Goodwill [Line Items]
Goodwill		$ 225.2	$ 227.2
Accumulated goodwill impairment		528.0	528.0	$ 528.0
Gross carrying amount		133.2	134.8
Finite-lived intangible assets, period increase (decrease)		(0.5)
Accumulated amortization		97.3	91.1
Software and other amortization		7.0	$ 7.0	$ 7.0
2026		7.0
2027		7.0
2028		7.0
2029		4.0
2030		4.0
East Hartford, CT | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Goodwill [Line Items]
Disposal group, including discontinued operation, finite-lived intangible assets, Gross		1.6
Disposal group, including discontinued operation, finite-lived intangible assets, accumulated amortization		$ 1.1
Weighted Average Cost of Capital | Fair Value, Inputs, Level 3
Goodwill [Line Items]
Goodwill, fair value measurement input		0.105
Long Term Growth Rate | Fair Value, Inputs, Level 3 | Minimum
Goodwill [Line Items]
Goodwill, fair value measurement input		0.03
Long Term Growth Rate | Fair Value, Inputs, Level 3 | Maximum
Goodwill [Line Items]
Goodwill, fair value measurement input		0.035
Forged Products
Goodwill [Line Items]
Goodwill		$ 159.2
Specialty Materials
Goodwill [Line Items]
Goodwill		$ 66.0
East Hartford, CT | Forged Products
Goodwill [Line Items]
Goodwill, written off related to sale of business unit	$ 2.0