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Goodwill and Identifiable Intangibles (Goodwill) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2016
Goodwill [Roll Forward]        
Beginning balance   $ 718.6 $ 708.9  
Acquisitions   89.5 10.1 [1]  
Foreign currency translation   19.3 (0.4)  
Ending balance   827.4 718.6  
Accumulated impairment losses       $ 215.1
Goodwill impairment loss $ 0.0      
ACCO Brands North America        
Goodwill [Roll Forward]        
Beginning balance   375.6 375.6  
Acquisitions   85.6 0.0  
Foreign currency translation   0.0 0.0  
Ending balance   461.2 375.6  
ACCO Brands EMEA        
Goodwill [Roll Forward]        
Beginning balance   165.7 165.6  
Acquisitions   0.0 0.0  
Foreign currency translation   22.5 0.1  
Ending balance   188.2 165.7  
ACCO Brands International        
Goodwill [Roll Forward]        
Beginning balance   177.3 167.7  
Acquisitions   3.9 10.1 [1]  
Foreign currency translation   (3.2) (0.5)  
Ending balance   $ 178.0 $ 177.3  
[1] (1) Goodwill has been recorded on our Consolidated Balance Sheet related to the PowerA Acquisition and represents the excess of the cost of the PowerA Acquisition when compared to the fair value estimate of the net assets acquired on December 17, 2020 (the date of the PowerA Acquisition). Goodwill has been recorded on our Consolidated Balance Sheet related to the Foroni Acquisition and represents the excess of the cost of the Foroni Acquisition when compared to the fair value estimate of the net assets acquired on August 1, 2019 (the effective date of the Foroni Acquisition). Goodwill has been recorded on our Consolidated Balance Sheet related to the GOBA Acquisition and represents the excess of the cost of the GOBA Acquisition when compared to the fair value estimate of the net assets acquired on July 2, 2018 (the date of the GOBA Acquisition). See "Note 3. Acquisitions" for details on the calculation of the goodwill acquired in the acquisitions.