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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Parenthetical) (Details) - Pension - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
United States          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net periodic benefit (income) cost [1] $ (0.7)   $ (0.4) $ (2.1) $ (1.2)
International          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net periodic benefit (income) cost [1] $ 1.3   $ 0.9 $ 8.3 $ 2.6
International | ACCO Brands International          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net periodic benefit (income) cost   $ 3.6      
[1] The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense" in the Consolidated Statements of Income (Loss).