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Information on Operating Segments - Assets by Segment (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |
Assets |  | $ 2,228.4 | $ 2,644.8 |
Goodwill |  | 446.4 | 590.0 | $ 671.5
Identifiable intangibles, net |  | 709.6 | 815.7 |
Property, plant and equipment, net | [1] | 137.5 | 170.1 |
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets | [2] | 619.3 | 758.2 |
Unallocated Assets |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets | [3] | 315.6 | 310.8 |
ACCO Brands Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill |  | 253.3 | 383.6 | 472.2
Property, plant and equipment, net |  | 74.7 | 98.8 |
ACCO Brands Americas | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets |  | 418.0 | 533.5 |
ACCO Brands International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill |  | 193.1 | 206.4 | $ 199.3
Property, plant and equipment, net |  | 62.8 | 71.3 |
ACCO Brands International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets |  | $ 201.3 | $ 224.7 |
[1] | Net property, plant and equipment as of December 31, 2024 and 2023 included $29.4 million and $37.9 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $13.8 million, $14.1 million and $13.9 million for the years ended December 31, 2024, 2023 and 2022, respectively.
[2] | Segment assets represent assets that are regularly provided to the CODM and consist of accounts receivable less allowances and inventory.
[3] | Unallocated assets consist primarily of cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs and right of use asset, leases.

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