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Goodwill and Identifiable Intangible Assets - Summary of Changes in Net Carrying Amount Goodwill By Segment (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 446.4
Acquisitions	4.2	[1]
Foreign currency translation	21.2
Ending balance	471.8
ACCO Brands Americas
Goodwill [Roll Forward]
Beginning balance	253.3
Acquisitions	0.0	[1]
Foreign currency translation	1.3
Ending balance	254.6
ACCO Brands International
Goodwill [Roll Forward]
Beginning balance	193.1
Acquisitions	4.2	[1]
Foreign currency translation	19.9
Ending balance	$ 217.2
[1] Represents goodwill from the Buro Acquisition.

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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