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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Parenthetical) (Details) - Pension - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
United States |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net periodic benefit (income) cost | [1] | $ (0.7) | $ (0.7) | $ (1.4) | $ (1.4)
International |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net periodic benefit (income) cost | [1] | $ 1.5 | 5.7 | $ 2.9 | $ 7.0
International | ACCO Brands International |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net periodic benefit (income) cost |  |  | $ 3.6 |  |
[1] | The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense" in the Consolidated Statements of Income (Loss).

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