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Information On Business Segments (Net Sales by Segment) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of business segments | segment     3  
Net sales $ 505.7 $ 507.3 $ 1,418.3 $ 1,411.9
ACCO Brands North America        
Segment Reporting Information [Line Items]        
Net sales 272.4 263.4 740.7 711.8
ACCO Brands EMEA        
Segment Reporting Information [Line Items]        
Net sales 133.1 143.1 407.9 438.1
ACCO Brands International        
Segment Reporting Information [Line Items]        
Net sales $ 100.2 $ 100.8 $ 269.7 $ 262.0