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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.5 $ 1.6 $ 1.3
Interest cost 4.5 5.9 7.4
Expected return on plan assets (11.4) (11.4) (11.7)
Amortization of net loss (gain) 3.6 3.2 2.2
Amortization of prior service cost 0.1 0.4 0.4
Curtailment loss [1] 1.4 0.0 0.0
Settlement loss 0.0 0.0 0.0
Net periodic benefit cost (income) [2] (1.3) (0.3) (0.4)
Pension | International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1.5 1.5 1.3
Interest cost 6.3 9.7 13.4
Expected return on plan assets (19.3) (18.6) (20.5)
Amortization of net loss (gain) 7.1 4.9 3.3
Amortization of prior service cost 0.3 0.3 0.3
Curtailment loss [1] 0.0 0.0 0.0
Settlement loss 0.0 0.4 0.1
Net periodic benefit cost (income) [2] (4.1) (1.8) (2.1)
Post-retirement      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.1 0.2
Expected return on plan assets 0.0 0.0 0.0
Amortization of net loss (gain) (0.5) (0.5) (0.4)
Amortization of prior service cost 0.0 0.0 0.0
Curtailment loss [1] 0.0 0.0 0.0
Settlement loss 0.0 0.0 0.0
Net periodic benefit cost (income) [2] $ (0.4) $ (0.4) $ (0.2)
[1] Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney, New York bargained hourly employees under the ACCO Brands Corporation Pension Plan.
[2] The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.