Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 507.3	$ 532.2	$ 1,411.9	$ 1,382.0
Product and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	483.1		1,361.8
Product and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	24.2		50.1
ACCO Brands North America
Disaggregation of Revenue [Line Items]
Net sales	263.4	290.3	711.8	745.8
ACCO Brands North America | United States
Disaggregation of Revenue [Line Items]
Net sales	227.6	252.1	617.7	654.4
ACCO Brands North America | Canada
Disaggregation of Revenue [Line Items]
Net sales	35.8	38.2	94.1	91.4
ACCO Brands EMEA
Disaggregation of Revenue [Line Items]
Net sales	143.1	140.3	438.1	365.3
ACCO Brands International
Disaggregation of Revenue [Line Items]
Net sales	100.8	101.6	262.0	270.9
ACCO Brands International | Australia/N.Z.
Disaggregation of Revenue [Line Items]
Net sales	41.4	47.6	118.8	131.5
ACCO Brands International | Latin America
Disaggregation of Revenue [Line Items]
Net sales	47.6	43.2	106.7	105.1
ACCO Brands International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales	$ 11.8	$ 10.8	$ 36.5	$ 34.3