Information on Business Segments (Capital Spend by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total capital spend	$ 15.3	$ 32.8	$ 34.1
ACCO Brands North America
Segment Reporting Information [Line Items]
Total capital spend	9.3	21.7	24.3
ACCO Brands EMEA
Segment Reporting Information [Line Items]
Total capital spend	4.0	7.0	6.1
ACCO Brands International
Segment Reporting Information [Line Items]
Total capital spend	$ 2.0	$ 4.1	$ 3.7

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration