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Goodwill and Identifiable Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Net Carrying Amount of Goodwill by Segment | Changes in the net carrying amount of goodwill by segment were as follows:
(in millions) |  | ACCO Brands Americas |  |  | ACCO Brands International |  |  | Total |
Balance at December 31, 2023 |  | $ | 383.6 |  |  | $ | 206.4 |  |  | $ | 590.0 |
Foreign currency translation |  |  | (0.2 | ) |  |  | (12.7 | ) |  |  | (12.9 | )
Balance at March 31, 2024 |  | $ | 383.4 |  |  | $ | 193.7 |  |  | $ | 577.1 |
Gross Carrying Value and Accumulated Amortization by Class of Identifiable Intangible Assets | The gross carrying value and accumulated amortization by class of identifiable intangible assets as of March 31, 2024 and December 31, 2023, were as follows:
|  | March 31, 2024 |  |  | December 31, 2023 |
(in millions) |  | Gross Carrying Amounts |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Carrying Amounts |  |  | Accumulated Amortization |  |  | Net Book Value |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names(1) |  | $ | 295.1 |  |  | $ | (44.5 | ) |  | $ | 250.6 |  |  | $ | 295.1 |  |  | $ | (44.5 | ) |  | $ | 250.6 |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 489.8 |  |  |  | (145.1 | ) |  |  | 344.7 |  |  |  | 497.1 |  |  |  | (142.0 | ) |  |  | 355.1 |
Customer and contractual relationships |  |  | 358.0 |  |  |  | (222.6 | ) |  |  | 135.4 |  |  |  | 362.4 |  |  |  | (221.3 | ) |  |  | 141.1 |
Vendor relationships |  |  | 82.4 |  |  |  | (18.1 | ) |  |  | 64.3 |  |  |  | 82.4 |  |  |  | (16.7 | ) |  |  | 65.7 |
Patents |  |  | 8.0 |  |  |  | (5.1 | ) |  |  | 2.9 |  |  |  | 8.2 |  |  |  | (5.0 | ) |  |  | 3.2 |
Subtotal |  |  | 938.2 |  |  |  | (390.9 | ) |  |  | 547.3 |  |  |  | 950.1 |  |  |  | (385.0 | ) |  |  | 565.1 |
Total identifiable intangibles |  | $ | 1,233.3 |  |  | $ | (435.4 | ) |  | $ | 797.9 |  |  | $ | 1,245.2 |  |  | $ | (429.5 | ) |  | $ | 815.7 |
(1) Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.
Estimated Amortization Expense for Future Periods | Estimated amortization expense for amortizable intangible assets, as of March 31, 2024, for the current year and the next five years is as follows:
(in millions) |  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |
Estimated amortization expense(2) |  | $ | 42.1 |  |  | $ | 40.5 |  |  | $ | 38.4 |  |  | $ | 36.0 |  |  | $ | 33.8 |  |  | $ | 32.0 |
(2) Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.

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