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Disposal related costs - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Graphic Arts
Asset Acquisition [Line Items]
Disposal related costs	$ 0.0	$ 0.1	$ 0.1	$ 2.0
Loss on held for sale asset group	1.1	0.0	1.1	7.5
Professional fees
Asset Acquisition [Line Items]
Disposal related costs	$ 0.1		$ 0.1
Professional fees | Graphic Arts
Asset Acquisition [Line Items]
Disposal related costs		$ 0.1		$ 2.0

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- Definition

Disposal Group, Not Discontinued Operation, Disposal Cost

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
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-Name Accounting Standards Codification
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-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480123/805-50-15-3

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- Definition

Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
-Paragraph 5
-SubTopic 10
-Topic 360
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (d)
-Publisher FASB
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