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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Expected contributions to defined benefit plans for 2022 $ 17.6   $ 17.6  
Contributions by company to date     6.6  
Pension | United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 $ 0.1 0.0 $ 0.5
Interest cost 1.2 1.2 2.4 2.2
Expected return on plan assets (2.7) (2.8) (5.4) (5.6)
Amortization of prior service cost 0.0 0.0 0.0 0.1
Amortization of net loss (gain) 0.9 0.8 1.8 1.8
Curtailment loss [1]     0.0 1.4
Net periodic benefit (income) cost [2] (0.6) (0.7) (1.2) 0.4
Pension | International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.2 0.4 0.5 0.8
Interest cost 2.4 1.6 4.9 3.2
Expected return on plan assets (4.5) (5.0) (9.1) (9.8)
Amortization of prior service cost 0.1 0.0 0.1 0.1
Amortization of net loss (gain) 1.3 1.8 2.7 3.6
Curtailment loss [1]     0.0 0.0
Net periodic benefit (income) cost [2] (0.5) (1.2) (0.9) (2.1)
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) (0.2) (0.2)
Curtailment loss [1]     0.0 0.0
Net periodic benefit (income) cost [2] $ (0.1) $ (0.1) $ (0.2) $ (0.2)
[1] Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan.
[2] 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.