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Goodwill and Identifiable Intangibles (Goodwill) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance			$ 708.9	$ 670.3
Acquisitions	[1]		10.1	2.4
Foreign currency translation			(0.4)	36.2
Ending balance			718.6	708.9
Accumulated impairment losses					$ 215.1
Goodwill impairment loss		$ 0.0
ACCO Brands North America
Goodwill [Roll Forward]
Beginning balance			375.6	375.6
Acquisitions			0.0	0.0
Foreign currency translation			0.0	0.0
Ending balance			375.6	375.6
ACCO Brands EMEA
Goodwill [Roll Forward]
Beginning balance			165.6	129.4
Acquisitions			0.0	0.0
Foreign currency translation			0.1	36.2
Ending balance			165.7	165.6
ACCO Brands International
Goodwill [Roll Forward]
Beginning balance			167.7	165.3
Acquisitions	[1]		10.1	2.4
Foreign currency translation			(0.5)	0.0
Ending balance			$ 177.3	$ 167.7
[1] (1) Goodwill has been recorded on our Consolidated Balance Sheet related to the GOBA Acquisition and represents the excess of the cost of the GOBA Acquisition when compared to the fair value estimate of the net assets acquired on July 2, 2018 (the date of the GOBA Acquisition). Goodwill has been recorded on our Consolidated Balance Sheet related to the Foroni Acquisition and represents the excess of the cost of the Foroni Acquisition when compared to the fair value estimate of the net assets acquired on August 1, 2019 (the effective date of the Foroni Acquisition). See "Note 3. Acquisitions" for details on the calculation of the goodwill acquired in the acquisitions.

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