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Held-for-sale assets and liabilities - Schedule Of Proceeds Of Held-for-Sale Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jul. 02, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss on disposal	$ 0.0	$ 6.1	$ 0.0
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	(2.3)
Transaction costs	(2.1)
Net proceeds	2.9
Net assets disposed				$ (4.6)
Accrued transaction costs	(0.2)
Net loss on disposal	$ (1.9)

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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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