Information On Business Segments (Operating Income by Segment) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Operating income	[1]	$ 11.7	$ 7.2
Interest expense		9.4	9.8
Interest income		(1.0)	(1.3)
Non-operating pension income		(2.2)	(2.1)
Other (income) expense, net		(0.6)	0.7
Income before income tax		6.1	0.1
Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	22.8	19.5
Corporate
Segment Reporting Information [Line Items]
Operating income	[1]	(11.1)	(12.3)
ACCO Brands North America | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	2.9	5.8
ACCO Brands EMEA | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	14.1	3.6
ACCO Brands International | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	$ 5.8	$ 10.1

[1] Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less advertising, selling, general and administrative expenses; iv) less amortization of intangibles; and v) less restructuring charges.