Goodwill and Identifiable Intangibles (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Balance at December 31, 2016		$ 587.1	$ 587.1
Translation			(23.3)
Balance at December 31, 2017			670.3
Goodwill, Impairment Loss	$ 0.0	0.0
Accumulated impairment losses				$ (215.1)
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0.0
Esselte Acquisition
Goodwill [Roll Forward]
Esselte Acquisition			106.5
ACCO Brands North America
Goodwill [Roll Forward]
Balance at December 31, 2016		380.7	380.7
Translation			0.0
Balance at December 31, 2017			375.6
ACCO Brands North America | Esselte Acquisition
Goodwill [Roll Forward]
Esselte Acquisition			(5.1)
ACCO Brands EMEA
Goodwill [Roll Forward]
Balance at December 31, 2016		39.5	39.5
Translation			(23.3)
Balance at December 31, 2017			129.4
ACCO Brands EMEA | Esselte Acquisition
Goodwill [Roll Forward]
Esselte Acquisition			113.2
ACCO Brands International
Goodwill [Roll Forward]
Balance at December 31, 2016		$ 166.9	166.9
Translation			0.0
Balance at December 31, 2017			165.3
ACCO Brands International | Esselte Acquisition
Goodwill [Roll Forward]
Esselte Acquisition			$ (1.6)