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Information on Business Segments (Assets by Segment) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Assets $ 3,048.7 $ 2,788.6
Operating Segments    
Segment Reporting Information [Line Items]    
Assets 939.3 1,045.4
Unallocated Assets    
Segment Reporting Information [Line Items]    
Assets 2,108.1 1,742.3
Corporate    
Segment Reporting Information [Line Items]    
Assets [1] 1.3 0.9
ACCO Brands North America | Operating Segments    
Segment Reporting Information [Line Items]    
Assets [1] 401.4 403.4
ACCO Brands EMEA | Operating Segments    
Segment Reporting Information [Line Items]    
Assets [1] 265.8 257.9
ACCO Brands International | Operating Segments    
Segment Reporting Information [Line Items]    
Assets [1] $ 272.1 $ 384.1
[1] Represents total assets, excluding goodwill and identifiable intangibles resulting from business acquisitions, intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs and right of use asset, leases.