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Goodwill and Identifiable Intangible Assets - Summary of Changes in Net Carrying Amount Goodwill By Segment (Details) - USD ($) $ in Millions		9 Months Ended
	May 31, 2024	Sep. 30, 2024
Goodwill [Roll Forward]
Beginning balance		$ 590.0
Goodwill impairment	$ (127.5)	(127.5)
Foreign currency translation		(3.5)
Ending balance		459.0
ACCO Brands Americas
Goodwill [Roll Forward]
Beginning balance		383.6
Goodwill impairment		(127.5)
Foreign currency translation		(1.5)
Ending balance		254.6
ACCO Brands International
Goodwill [Roll Forward]
Beginning balance		206.4
Goodwill impairment		0.0
Foreign currency translation		(2.0)
Ending balance		$ 204.4

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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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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit 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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