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Restructuring (Restructuring Charges) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 27.2 $ 9.6 $ 6.0
ACCO Brands North America      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 16.7 5.3 4.4
ACCO Brands EMEA      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 8.9 3.4 0.5
ACCO Brands International      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 1.0 0.7 1.1
Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.6 0.2 0.0
Employee termination costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 26.1 [1] 9.4 5.2
Termination of lease agreements      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   (0.2) 0.7
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 1.1 [2] $ 0.4 $ 0.1
[1] We expect the remaining $27.5 million of employee termination costs to be substantially paid within the next twelve months
[2] We expect the remaining $0.9 million in other costs to be substantially paid within the next twelve months.