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Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Net sales $ 1,655.2 $ 1,955.7 $ 1,941.2
Product and services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Net sales 1,604.3 1,892.9 1,878.2
Product and services transferred over time      
Disaggregation of Revenue [Line Items]      
Net sales 50.9 62.8 63.0
ACCO Brands North America      
Disaggregation of Revenue [Line Items]      
Net sales 822.1 966.8 940.7
ACCO Brands North America | U.S.      
Disaggregation of Revenue [Line Items]      
Net sales 725.3 847.9 819.7
ACCO Brands North America | Canada      
Disaggregation of Revenue [Line Items]      
Net sales 96.8 118.9 121.0
ACCO Brands EMEA      
Disaggregation of Revenue [Line Items]      
Net sales 523.9 569.3 605.2
ACCO Brands International      
Disaggregation of Revenue [Line Items]      
Net sales 309.2 419.6 395.3
ACCO Brands International | Australia/N.Z.      
Disaggregation of Revenue [Line Items]      
Net sales 128.7 145.3 169.2
ACCO Brands International | Latin America      
Disaggregation of Revenue [Line Items]      
Net sales 138.8 229.1 178.0
ACCO Brands International | Asia-Pacific      
Disaggregation of Revenue [Line Items]      
Net sales $ 41.7 $ 45.2 $ 48.1