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Disposal related costs - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Business Combination [Line Items]
Loss on held-for-sale asset group	$ 0.0	$ 6.1	$ 0.0
Loss on held-for-sale asset group	1.9	9.8	0.0
Graphic Arts
Business Combination [Line Items]
Disposal related costs	$ 0.1	2.4	0.0
Loss on held-for-sale asset group		$ 9.8	$ 0.0

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