Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on assets held-for-sale	$ (2.8)		$ (2.8)
Discontinued Operations, Held-for-sale \| Superform Aluminum Superplastic
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	2.7	$ 1.6	6.8	$ 4.7
Cost of goods sold	(1.6)	(1.1)	(4.9)	(3.6)
Gross profit	1.1	0.5	1.9	1.1
Selling, general and administrative expenses	(1.0)	(0.3)	(1.8)	(1.1)
Restructuring credit / (charge)	0.1	0.0	0.4	(0.1)
Loss on assets held-for-sale	0.0	0.0	(2.8)	0.0
Operating income / (loss)	0.2	0.2	(2.3)	(0.1)
Tax (charge) / credit	0.0	(0.1)	0.1	0.0
Net income / (loss)	$ 0.2	$ 0.1	$ (2.2)	$ (0.1)

Disposal Group, Including Discontinued Operation, Restructuring Credit (Charge)

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Amount after tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until disposal.

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Amount before tax of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a discontinued operation.

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Amount of tax expense (benefit) attributable to income (loss) from operations classified as a discontinued operation. Excludes tax expense (benefit) for gain (loss) on disposal and for provision for gain (loss) until disposal.

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Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of gross profit attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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