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Information on Business Segments (Property, Plant and Equipment by Geographic Region) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Property, plant and equipment, net [1] $ 241.4 $ 267.1
ACCO Brands North America    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 108.3 118.3
ACCO Brands North America | U.S.    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 107.1 116.6
ACCO Brands North America | Canada    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 1.2 1.7
ACCO Brands EMEA | EMEA    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 88.8 92.8
ACCO Brands International    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 44.3 56.0
ACCO Brands International | Australia/N.Z.    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 12.3 12.1
ACCO Brands International | Latin America    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 30.4 42.2
ACCO Brands International | Asia-Pacific    
Segment Reporting Information [Line Items]    
Property, plant and equipment, net $ 1.6 $ 1.7
[1] Net property, plant and equipment as of December 31, 2020 and 2019 contained $65.8 million and $68.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $11.4 million, $8.9 million and $8.2 million for the years ended December 31, 2020, 2019 and 2018, respectively.