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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Parenthetical) (Details) - Pension Plan [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
United States |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement | [1] | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
International |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement | [1] | $ 4.4 | $ 0.0 | $ 4.4 | $ 0.0
[1] | Settlement of $4.4 million resulting from the wind-up of the ACCO Brands Canada Salaried and Hourly pension plans being completed in the second quarter of 2024.

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