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Held-for-sale assets and liabilities - Schedule of Carrying Amount Of Held-for-Sale Assets and Liabilities At Disposal Date (Details) - USD ($) $ in Millions	Sep. 28, 2025	Sep. 02, 2025	Jul. 02, 2025	Dec. 31, 2024
Assets
Current assets	$ 6.8			$ 22.5
Liabilities
Current liabilities	$ 2.8			$ 12.8
Held-for-sale | Graphic Arts
Assets
Inventory			$ 7.8
Prepayments and accrued income			0.9
Accounts and other receivables			3.8
Current assets			12.5
Property, plant and equipment			0.5
Right-of-use-assets			2.3
Non-current assets			2.8
Total assets			15.3
Liabilities
Accounts payable			0.6
Accrued liabilities			4.4
Other current liabilities			5.5
Current liabilities			10.5
Net assets disposed		$ 4.8	$ 4.8

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