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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Expected contributions to defined benefit plans for 2021 $ 24.5   $ 24.5  
Contributions by company to date     10.5  
Pension | United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1 $ 0.4 0.5 $ 0.8
Interest cost 1.2 1.4 2.2 2.9
Expected return on plan assets (2.8) (2.8) (5.6) (5.7)
Amortization of net loss (gain) 0.8 0.8 1.8 1.6
Amortization of prior service cost 0.0 0.1 0.1 0.2
Curtailment loss     1.4 [1] 0.0
Net periodic benefit cost (income) [2] (0.7) (0.1) 0.4 (0.2)
Pension | International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.4 0.3 0.8 0.7
Interest cost 1.6 2.4 3.2 4.8
Expected return on plan assets (5.0) (4.4) (9.8) (9.1)
Amortization of net loss (gain) 1.8 1.2 3.6 2.4
Amortization of prior service cost 0.0 0.0 0.1 0.1
Curtailment loss     0.0 0.0
Net periodic benefit cost (income) [2] (1.2) (0.5) (2.1) (1.1)
Post-retirement        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.0 0.1 0.0 0.1
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of net loss (gain) (0.1) (0.2) (0.2) (0.3)
Amortization of prior service cost 0.0 0.0 0.0 0.0
Curtailment loss     0.0 0.0
Net periodic benefit cost (income) [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 cost (income), other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.