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Restructuring (Restructuring Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 10.9	$ 12.0	$ 11.7
Operating Segments | ACCO Brands North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7.6	5.6	6.2
Operating Segments | ACCO Brands EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.6	2.3	4.9
Operating Segments | ACCO Brands International
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.6	2.7	0.6
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1	1.4	0.0
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8.5	10.9	8.3
Termination of lease agreements
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.5	0.5	3.2
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.9	$ 0.6	$ 0.2

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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