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Restructuring - Restructuring Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 21.6 [1] $ 16.8 $ 27.2
Operating Segments | ACCO Brands Americas      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 7.7 6.5 16.7
Operating Segments | ACCO Brands International      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 14.1 6.9 9.9
Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.2 3.4 0.6
Employee termination costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 18.8 16.6 26.1
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 2.8 $ 0.2 $ 1.1
[1] We expect $17.8 million of the remaining $23.0 million of employee termination costs to be substantially paid within the next twelve months