Information on Business Segments - Net Sales by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 438.3	$ 493.6	$ 797.2	$ 896.2
ACCO Brands Americas
Segment Reporting Information [Line Items]
Net sales	292.3	336.4	489.5	566.4
ACCO Brands International
Segment Reporting Information [Line Items]
Net sales	$ 146.0	$ 157.2	$ 307.7	$ 329.8