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Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Net sales $ 1,955.7 $ 1,941.2 $ 1,948.8
Product and services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Net sales 1,892.9 1,878.2  
Product and services transferred over time      
Disaggregation of Revenue [Line Items]      
Net sales 62.8 63.0  
ACCO Brands North America      
Disaggregation of Revenue [Line Items]      
Net sales 966.8 940.7 999.0
ACCO Brands North America | U.S.      
Disaggregation of Revenue [Line Items]      
Net sales 847.9 819.7 880.4
ACCO Brands North America | Canada      
Disaggregation of Revenue [Line Items]      
Net sales 118.9 121.0 118.6
ACCO Brands EMEA      
Disaggregation of Revenue [Line Items]      
Net sales 569.3 605.2 542.8
ACCO Brands International      
Disaggregation of Revenue [Line Items]      
Net sales 419.6 395.3 407.0
ACCO Brands International | Australia/N.Z.      
Disaggregation of Revenue [Line Items]      
Net sales 145.3 169.2 187.9
ACCO Brands International | Latin America      
Disaggregation of Revenue [Line Items]      
Net sales 229.1 178.0 173.3
ACCO Brands International | Asia-Pacific      
Disaggregation of Revenue [Line Items]      
Net sales $ 45.2 $ 48.1 $ 45.8