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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.

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