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Information on Business Segments (Operating Income by Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Operating income $ 42.2 $ 34.3 $ 18.5 $ 17.4 $ 68.1 $ 48.8 $ 61.4 $ 17.9 $ 112.4 [1] $ 196.2 [1] $ 187.0 [1]
Interest expense                 38.8 43.2 41.2
Interest income                 (1.0) (3.2) (4.4)
Non-operating pension income                 (5.6) (5.5) (9.3)
Other expense (income), net                 1.6 (1.8) 1.6
Income before income tax                 78.6 163.5 157.9
Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income [1]                 150.2 238.1 225.2
Corporate                      
Segment Reporting Information [Line Items]                      
Operating income                 (37.8) (41.9) (38.2)
Transaction costs                 3.7 1.6 0.5
ACCO Brands North America | Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income                 83.0 131.0 116.6
ACCO Brands EMEA | Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income                 51.6 58.6 59.4
ACCO Brands International | Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income                 $ 15.6 $ 48.5 $ 49.2
[1] Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less SG&A expenses; iv) less amortization of intangibles; and v) less restructuring charges.