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Pension and Other Retiree Benefits - Pension Benefit Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in plan assets      
Employer contributions $ 16.9    
Amounts recognized in the Consolidated Balance Sheets consist of:      
Pension and post-retirement benefit obligations 157.6 $ 155.5  
Pension | U.S.      
Change in projected benefit obligation (PBO)      
Projected benefit obligation at beginning of year 162.3 212.5  
Service cost 0.0 0.0 $ 0.5
Interest cost 7.9 4.9 4.5
Actuarial loss (gain) 3.2 (45.2)  
Participants’ contributions 0.0 0.0  
Benefits paid (10.8) (9.9)  
Settlement 0.0 0.0  
Termination benefits [1] 0.0 0.0 0.0
Foreign exchange rate changes 0.0 0.0  
Projected benefit obligation at end of year 162.6 162.3 212.5
Change in plan assets      
Fair value of plan assets at beginning of year 140.2 180.9  
Actual return on plan assets 13.6 (33.3)  
Employer contributions 2.5 2.5  
Participants’ contributions 0.0 0.0  
Benefits paid (10.8) (9.9)  
Settlement 0.0 0.0  
Foreign exchange rate changes 0.0 0.0  
Fair value of plan assets at end of year 145.5 140.2 180.9
Funded status (Fair value of plan assets less PBO) (17.1) (22.1)  
Amounts recognized in the Consolidated Balance Sheets consist of:      
Other non-current assets 0.0 0.0  
Other current liabilities 0.0 0.0  
Pension and post-retirement benefit obligations 17.1 22.1  
Components of accumulated other comprehensive income (loss), net of tax:      
Unrecognized actuarial loss (gain) 90.7 91.3  
Unrecognized prior service cost 0.0 0.0  
Pension | International      
Change in projected benefit obligation (PBO)      
Projected benefit obligation at beginning of year 441.1 673.6  
Service cost 0.5 1.0 1.5
Interest cost 20.0 9.6 6.3
Actuarial loss (gain) 14.6 (158.7)  
Participants’ contributions 0.1 0.1  
Benefits paid (27.0) (25.7)  
Settlement (3.9) 0.0  
Termination benefits [1] 0.0 0.8 0.0
Foreign exchange rate changes 22.0 (59.6)  
Projected benefit obligation at end of year 467.4 441.1 673.6
Change in plan assets      
Fair value of plan assets at beginning of year 306.4 481.7  
Actual return on plan assets 18.9 (117.2)  
Employer contributions 14.1 13.4  
Participants’ contributions 0.1 0.1  
Benefits paid (27.0) (25.7)  
Settlement (4.0) 0.0  
Foreign exchange rate changes 16.4 (45.9)  
Fair value of plan assets at end of year 324.9 306.4 481.7
Funded status (Fair value of plan assets less PBO) (142.5) (134.7)  
Amounts recognized in the Consolidated Balance Sheets consist of:      
Other non-current assets 2.5 2.8  
Other current liabilities 7.5 6.9  
Pension and post-retirement benefit obligations 137.5 130.6  
Components of accumulated other comprehensive income (loss), net of tax:      
Unrecognized actuarial loss (gain) 139.9 120.6  
Unrecognized prior service cost 5.2 5.2  
Post-retirement      
Change in projected benefit obligation (PBO)      
Projected benefit obligation at beginning of year 3.2 4.3  
Service cost 0.0 0.0 0.0
Interest cost 0.2 0.1 0.1
Actuarial loss (gain) 0.1 (0.6)  
Participants’ contributions 0.0 0.0  
Benefits paid (0.3) (0.4)  
Settlement 0.0 0.0  
Termination benefits [1] 0.0 0.0 0.0
Foreign exchange rate changes 0.1 (0.2)  
Projected benefit obligation at end of year 3.3 3.2 4.3
Change in plan assets      
Fair value of plan assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 0.3 0.4  
Participants’ contributions 0.0 0.0  
Benefits paid (0.3) (0.4)  
Settlement 0.0 0.0  
Foreign exchange rate changes 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 $ 0.0
Funded status (Fair value of plan assets less PBO) (3.3) (3.2)  
Amounts recognized in the Consolidated Balance Sheets consist of:      
Other non-current assets 0.0 0.0  
Other current liabilities 0.3 0.4  
Pension and post-retirement benefit obligations 3.0 2.8  
Components of accumulated other comprehensive income (loss), net of tax:      
Unrecognized actuarial loss (gain) (3.6) (4.2)  
Unrecognized prior service cost $ 0.0 $ 0.0  
[1] Special termination benefit of $0.8 million due to the plan wind-up of the ACCO Brands Canada Salaried and Hourly plans effective July 1, 2022. The plan wind-up is considered an irrevocable event that triggers special accounting, specifically a one-time special termination benefit. The plan wind-up is expected to be completed in 2024.