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Goodwill and Identifiable Intangible Assets - Summary of Changes in Net Carrying Amount Goodwill By Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Beginning balance $ 446.4 $ 590.0
Acquisitions [1] 4.2  
Goodwill impairment   $ (127.5)
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment Of Intangible Assets Indefinite Lived Including Goodwill
Foreign currency translation 27.9 $ (16.1)
Ending balance 478.5 446.4
ACCO Brands Americas    
Goodwill [Roll Forward]    
Beginning balance 253.3 383.6
Acquisitions [1] 0.0  
Goodwill impairment   $ (127.5)
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment Of Intangible Assets Indefinite Lived Including Goodwill
Foreign currency translation 1.4 $ (2.8)
Ending balance 254.7 253.3
ACCO Brands International    
Goodwill [Roll Forward]    
Beginning balance 193.1 206.4
Acquisitions [1] 4.2  
Goodwill impairment   $ 0.0
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment Of Intangible Assets Indefinite Lived Including Goodwill
Foreign currency translation 26.5 $ (13.3)
Ending balance $ 223.8 $ 193.1
[1] Represents goodwill from the Buro Acquisition.