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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.5
Interest cost 7.9 4.9 4.5
Expected return on plan assets (12.0) (10.9) (11.4)
Amortization of net loss (gain) 2.2 3.7 3.6
Amortization of prior service cost 0.0 0.0 0.1
Special termination benefit [1] 0.0 0.0 0.0
Curtailment loss [2] 0.0 0.0 1.4
Settlement loss 0.0 0.0 0.0
Net periodic benefit cost (income) cost [3] (1.9) (2.3) (1.3)
Pension | International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.5 1.0 1.5
Interest cost 20.0 9.6 6.3
Expected return on plan assets (21.5) (17.5) (19.3)
Amortization of net loss (gain) 4.2 5.0 7.1
Amortization of prior service cost 0.3 0.3 0.3
Special termination benefit [1] 0.0 0.8 0.0
Curtailment loss [2] 0.0 0.0 0.0
Settlement loss (1.2) 0.0 0.0
Net periodic benefit cost (income) cost [3] 4.7 (0.8) (4.1)
Post-retirement      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 0.2 0.1 0.1
Expected return on plan assets 0.0 0.0
Amortization of net loss (gain) (0.5) (0.5) (0.5)
Amortization of prior service cost 0.0 0.0 0.0
Special termination benefit [1] 0.0 0.0 0.0
Curtailment loss [2] 0.0 0.0 0.0
Settlement loss 0.0 0.0 0.0
Net periodic benefit cost (income) cost [3] $ (0.3) $ (0.4) $ (0.4)
[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.
[2] Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan.
[3] The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense (income)" in the Consolidated Statements of Income (Loss).