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Goodwill and Identifiable Intangible Assets - Summary of Changes in Net Carrying Amount Goodwill By Segment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 446.4
Acquisitions	4.2	[1]
Foreign currency translation	21.8
Ending balance	472.4
ACCO Brands Americas
Goodwill [Roll Forward]
Beginning balance	253.3
Acquisitions	0.0	[1]
Foreign currency translation	1.7
Ending balance	255.0
ACCO Brands International
Goodwill [Roll Forward]
Beginning balance	193.1
Acquisitions	4.2	[1]
Foreign currency translation	20.1
Ending balance	$ 217.4
[1] Represents goodwill from the Buro Acquisition.

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