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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Expected contributions to defined benefit plans for 2022 $ 17.4   $ 17.4  
Contributions by company to date     11.0  
Pension | United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 $ 0.0 0.0 $ 0.5
Interest cost 1.2 1.2 3.6 3.4
Expected return on plan assets (2.7) (2.9) (8.1) (8.5)
Amortization of prior service cost 0.0 0.0 0.0 0.1
Amortization of net loss (gain) 0.9 0.9 2.7 2.7
Special termination benefit [1] 0.0 0.0 0.0 0.0
Curtailment loss [2]     0.0 1.4
Net periodic benefit (income) cost [3] (0.6) (0.8) (1.8) (0.4)
Pension | International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.2 0.4 0.7 1.2
Interest cost 2.3 1.5 7.2 4.7
Expected return on plan assets (4.2) (4.7) (13.3) (14.5)
Amortization of prior service cost 0.1 0.1 0.2 0.2
Amortization of net loss (gain) 1.2 1.7 3.9 5.3
Special termination benefit [1] 0.8 0.0 0.8 0.0
Curtailment loss [2]     0.0 0.0
Net periodic benefit (income) cost [3] 0.4 (1.0) (0.5) (3.1)
Post-retirement        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.0 0.0 0.0 0.0
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost 0.0 0.0 0.0 0.0
Amortization of net loss (gain) (0.1) (0.1) (0.3) (0.3)
Special termination benefit [1] 0.0 0.0 0.0 0.0
Curtailment loss [2]     0.0 0.0
Net periodic benefit (income) cost [3] $ (0.1) $ (0.1) $ (0.3) $ (0.3)
[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 income" in the Consolidated Statements of Income.