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Held-for-sale assets and liabilities - Additional information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023	Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on held for sale asset group			$ 7.5	$ 0.0
Restructuring charges	$ 0.5	$ 1.6	2.3	4.4
Gain on disposal of assets held-for-sale	6.1	$ 0.0	6.1	$ 0.0
Graphic Arts | Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on held for sale asset group	7.5
Restructuring charges			$ 1.4
Elektron | Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of assets held-for-sale	$ 6.1
Elektron | Held-for-sale | Subsequent event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration of disposal					$ 7.3

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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