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Goodwill And Identifiable Intangibles (Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2016
Goodwill [Roll Forward]
Balance at December 31, 2018	$ 708.9
Acquisitions	12.3
Translation	(11.5)
Balance at September 30, 2019	709.7
Goodwill, accumulated impairment losses		$ 215.1
ACCO Brands North America
Goodwill [Roll Forward]
Balance at December 31, 2018	375.6
Acquisitions	0.0
Translation	0.0
Balance at September 30, 2019	375.6
ACCO Brands EMEA
Goodwill [Roll Forward]
Balance at December 31, 2018	165.6
Acquisitions	0.0
Translation	(10.4)
Balance at September 30, 2019	155.2
ACCO Brands International
Goodwill [Roll Forward]
Balance at December 31, 2018	167.7
Acquisitions	12.3
Translation	(1.1)
Balance at September 30, 2019	$ 178.9

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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