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Information on Business Segments - Identifiable Intangibles and Goodwill by Segment (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		$ 2,543.6	$ 2,644.8
Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		2,206.7	2,363.1
Unallocated Assets
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		333.3	278.4
Corporate
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	3.6	3.3
ACCO Brands Americas | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	1,516.0	1,624.6
ACCO Brands International | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	$ 690.7	$ 738.5
[1] Represents total assets, excluding intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs.

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- Definition

Segment Assets including Identifiable Intangible Assets and Goodwill

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