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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Parenthetical) (Details) - Pension Plan [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
United States |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement | [1] |  | $ 0.0 |  | $ 0.0 |
International |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement |  | $ 4.4 | $ 0.0 | [1] | $ 4.4 | [1]
[1] | Settlement of $4.4 million resulting from the wind-up of the ACCO Brands Canada Salaried and Hourly pension plans which was completed in the second quarter of 2024.

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