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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension | U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | $ 0.0 | $ 0.0 | $ 0.5
Interest cost |  | 7.9 | 4.9 | 4.5
Expected return on plan assets |  | (12.0) | (10.9) | (11.4)
Amortization of net loss (gain) |  | 2.2 | 3.7 | 3.6
Amortization of prior service cost |  | 0.0 | 0.0 | 0.1
Special termination benefit | [1] | 0.0 | 0.0 | 0.0
Curtailment loss | [2] | 0.0 | 0.0 | 1.4
Settlement loss |  | 0.0 | 0.0 | 0.0
Net periodic benefit cost (income) cost | [3] | (1.9) | (2.3) | (1.3)
Pension | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 0.5 | 1.0 | 1.5
Interest cost |  | 20.0 | 9.6 | 6.3
Expected return on plan assets |  | (21.5) | (17.5) | (19.3)
Amortization of net loss (gain) |  | 4.2 | 5.0 | 7.1
Amortization of prior service cost |  | 0.3 | 0.3 | 0.3
Special termination benefit | [1] | 0.0 | 0.8 | 0.0
Curtailment loss | [2] | 0.0 | 0.0 | 0.0
Settlement loss |  | (1.2) | 0.0 | 0.0
Net periodic benefit cost (income) cost | [3] | 4.7 | (0.8) | (4.1)
Post-retirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 0.0 | 0.0 | 0.0
Interest cost |  | 0.2 | 0.1 | 0.1
Expected return on plan assets |  |  | 0.0 | 0.0
Amortization of net loss (gain) |  | (0.5) | (0.5) | (0.5)
Amortization of prior service cost |  | 0.0 | 0.0 | 0.0
Special termination benefit | [1] | 0.0 | 0.0 | 0.0
Curtailment loss | [2] | 0.0 | 0.0 | 0.0
Settlement loss |  | 0.0 | 0.0 | 0.0
Net periodic benefit cost (income) cost | [3] | $ (0.3) | $ (0.4) | $ (0.4)
[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 expense (income)" in the Consolidated Statements of Income (Loss).

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