Information On Business Segments (Net Sales by Segment) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment			3
Net sales	$ 507.3	$ 532.2	$ 1,411.9	$ 1,382.0
ACCO Brands North America
Segment Reporting Information [Line Items]
Net sales	263.4	290.3	711.8	745.8
ACCO Brands EMEA
Segment Reporting Information [Line Items]
Net sales	143.1	140.3	438.1	365.3
ACCO Brands International
Segment Reporting Information [Line Items]
Net sales	$ 100.8	$ 101.6	$ 262.0	$ 270.9