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Held-for-sale assets and liabilities - Schedule Of Proceeds Of Held-for-Sale Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Jul. 02, 2025	Sep. 28, 2025	Sep. 29, 2024	Sep. 02, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds				$ 4.3	$ 0.0
Net loss on disposal	$ 0.0	$ 6.1		$ 0.0	$ 6.1
Held-for-sale | Graphic Arts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross consideration			$ 7.3
Working capital adjustment			(1.3)
Transaction costs			(1.7)
Net proceeds			4.3
Net assets disposed			(4.8)			$ (4.8)
Accrued transaction costs			(0.6)
Net loss on disposal			$ (1.1)

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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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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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