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Pension and Other Retiree Benefits (Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - Pension - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | [1] | $ 150.5 | $ 162.6
Fair value of plan assets |  | 145.4 | 145.5
International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | [1] | 116.8 | 437.4
Fair value of plan assets |  | $ 4.0 | $ 297.2
[1] | The decrease in 2024 under International as compared to 2023 is the result of the ACCO U.K. plan ABO no longer being in excess of plan assets as of December 31, 2024, unlike the prior year.

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