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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  |  |
Pension | U.S. |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | $ 0.0 |  | $ 0.5 |  | $ 1.6
Interest cost |  | 4.9 |  | 4.5 |  | 5.9
Expected return on plan assets |  | (10.9) |  | (11.4) |  | (11.4)
Amortization of net loss (gain) |  | 3.7 |  | 3.6 |  | 3.2
Amortization of prior service cost |  | 0.0 |  | 0.1 |  | 0.4
Special termination benefit |  | 0.0 |  | 0.0 |  | 0.0
Curtailment loss |  | 0.0 |  | 1.4 | [1] | 0.0
Settlement loss |  | 0.0 |  | 0.0 |  |
Net periodic benefit cost (income) cost | [2] | (2.3) |  | (1.3) |  | (0.3)
Pension | International |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 1.0 |  | 1.5 |  | 1.5
Interest cost |  | 9.6 |  | 6.3 |  | 9.7
Expected return on plan assets |  | (17.5) |  | (19.3) |  | (18.6)
Amortization of net loss (gain) |  | 5.0 |  | 7.1 |  | 4.9
Amortization of prior service cost |  | 0.3 |  | 0.3 |  | 0.3
Special termination benefit |  | 0.8 | [3] | 0.0 |  | 0.0
Curtailment loss |  | 0.0 |  | 0.0 |  | 0.0
Settlement loss |  | 0.0 |  | 0.0 |  | 0.4
Net periodic benefit cost (income) cost | [2] | (0.8) |  | (4.1) |  | (1.8)
Post-retirement |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.0 |  | 0.0 |  | 0.0
Interest cost |  | 0.1 |  | 0.1 |  | 0.1
Expected return on plan assets |  | 0.0 |  | 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 |  | 0.0 |  | 0.0 |  | 0.0
Curtailment loss |  | 0.0 |  | 0.0 |  | 0.0
Settlement loss |  | 0.0 |  | 0.0 |  | 0.0
Net periodic benefit cost (income) cost | [2] | $ (0.4) |  | $ (0.4) |  | $ (0.4)
[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.
[3] | 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.

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