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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Parenthetical) (Details) - Pension Plan [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
United States
Defined Benefit Plan Disclosure [Line Items]
Special termination benefit	[1]	$ 0.0	$ 0.0	$ 0.0	$ 0.0
International
Defined Benefit Plan Disclosure [Line Items]
Special termination benefit	[1]	$ 0.0	$ 0.8	$ 0.0	$ 0.8
[1] Special termination benefit of $0.8 million due to the wind up of the ACCO Brands Canada Salaried and Hourly plans effective July 1, 2022. The plan wind up is considered an irrevocable event that triggers special accounting, specifically a one-time special termination benefit. The plan wind up is expected to be completed in 2024.

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Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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