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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Parenthetical) (Details) - Pension Plan [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
United States      
Defined Benefit Plan Disclosure [Line Items]      
Settlement [1]   $ 0.0 $ 0.0
International      
Defined Benefit Plan Disclosure [Line Items]      
Settlement $ 4.4 $ (4.4) [1] $ 0.0 [1]
[1] Settlement of $4.4 million resulting from the wind-up of the ACCO Brands Canada Salaried and Hourly pension plans which was completed in the second quarter of 2024.