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Information on Business Segments (Property, Plant and Equipment by Geographic Region) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Property, plant and equipment, net $ 267.1 [1] $ 262.8 $ 263.7 [1]
ACCO Brands North America      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 118.3   113.6
ACCO Brands North America | U.S.      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 116.6   111.7
ACCO Brands North America | Canada      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 1.7   1.9
ACCO Brands EMEA | EMEA      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 92.8   100.0
ACCO Brands International      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 56.0   50.1
ACCO Brands International | Australia/N.Z.      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 12.1   13.1
ACCO Brands International | Latin America      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 42.2   35.1
ACCO Brands International | Asia-Pacific      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net $ 1.7   $ 1.9
[1]
Net property, plant and equipment as of December 31, 2019 and 2018 contained $68.5 million and $51.9 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $8.9 million, $8.2 million and $7.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.