Information On Business Segments (Operating Income by Segment) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Operating income	[1]	$ 58.7	$ 55.7	$ 113.4	$ 107.6
Interest expense		10.7	13.0	31.3	36.5
Interest income		(1.6)	(1.8)	(4.9)	(5.1)
Equity in earnings of joint-venture		0.0	0.0	0.0	(2.1)
Other (income) expense, net		(0.2)	6.8	(1.0)	(28.7)
Income (loss) before income tax		49.8	37.7	88.0	107.0
Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	70.6	68.4	149.3	141.9
Corporate
Segment Reporting Information [Line Items]
Operating income	[1]	(11.9)	(12.7)	(35.9)	(34.3)
ACCO Brands North America | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	50.4	49.6	109.5	112.6
ACCO Brands EMEA | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	9.0	2.9	14.5	4.7
ACCO Brands International | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	$ 11.2	$ 15.9	$ 25.3	$ 24.6

[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.