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Information On Business Segments (Net Sales by Segment) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Segment Reporting Information [Line Items]    
Number of business segments | segment 3  
Net sales $ 384.1 $ 393.9
ACCO Brands North America    
Segment Reporting Information [Line Items]    
Net sales 167.8 160.4
ACCO Brands EMEA    
Segment Reporting Information [Line Items]    
Net sales 127.5 146.5
ACCO Brands International    
Segment Reporting Information [Line Items]    
Net sales $ 88.8 $ 87.0