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Goodwill And Identifiable Intangibles (Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2016
Goodwill [Roll Forward]
Balance at December 31, 2019	$ 718.6
Acquisitions	3.9
Translation	0.9
Balance at September 30, 2020	723.4
Goodwill, accumulated impairment losses		$ 215.1
ACCO Brands North America
Goodwill [Roll Forward]
Balance at December 31, 2019	375.6
Acquisitions	0.0
Translation	0.0
Balance at September 30, 2020	375.6
ACCO Brands EMEA
Goodwill [Roll Forward]
Balance at December 31, 2019	165.7
Acquisitions	0.0
Translation	5.2
Balance at September 30, 2020	170.9
ACCO Brands International
Goodwill [Roll Forward]
Balance at December 31, 2019	177.3
Acquisitions	3.9
Translation	(4.3)
Balance at September 30, 2020	$ 176.9

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 210
-Section S99
-Paragraph 1
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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.

+ References

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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