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Information On Business Segments (Net Sales by Segment) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Segment Reporting Information [Line Items]        
Number of business segments | segment     3  
Net sales $ 444.1 $ 505.7 $ 1,195.1 $ 1,418.3
ACCO Brands North America        
Segment Reporting Information [Line Items]        
Net sales 238.5 272.4 638.0 740.7
ACCO Brands EMEA        
Segment Reporting Information [Line Items]        
Net sales 136.4 133.1 352.2 407.9
ACCO Brands International        
Segment Reporting Information [Line Items]        
Net sales $ 69.2 $ 100.2 $ 204.9 $ 269.7