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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
United States |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net periodic benefit (income) cost | [1] | $ (0.7) | $ (0.4) | $ (1.4) | $ (0.8)
International |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net periodic benefit (income) cost | [1] | 5.7 | $ 0.9 | $ 7.0 | $ 1.7
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 (Loss) Income.

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