Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 1,941.2	$ 1,948.8
Product and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	1,862.2
Product and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	79.0
ACCO Brands North America
Disaggregation of Revenue [Line Items]
Net sales	940.7	999.0
ACCO Brands North America | United States
Disaggregation of Revenue [Line Items]
Net sales	819.7	880.4
ACCO Brands North America | Canada
Disaggregation of Revenue [Line Items]
Net sales	121.0	118.6
ACCO Brands EMEA
Disaggregation of Revenue [Line Items]
Net sales	605.2	542.8
ACCO Brands International
Disaggregation of Revenue [Line Items]
Net sales	395.3	407.0
ACCO Brands International | Australia/N.Z.
Disaggregation of Revenue [Line Items]
Net sales	169.2	187.9
ACCO Brands International | Latin America
Disaggregation of Revenue [Line Items]
Net sales	178.0	173.3
ACCO Brands International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales	$ 48.1	$ 45.8