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Information on Operating Segments - Capital Spend by Segment (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total capital spend	$ 13.6	$ 17.0
ACCO Brands Americas
Segment Reporting Information [Line Items]
Total capital spend	10.0	10.2
ACCO Brands International
Segment Reporting Information [Line Items]
Total capital spend	$ 3.6	$ 6.8

X

- Definition

Amount of expenditure for addition to long-lived assets included in determination of segment assets by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Excludes expenditure for addition to financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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-Section 55
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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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

No definition available.

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