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Goodwill and Identifiable Intangible Assets - Narrative (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2024 USD ($) | Jan. 01, 2024 Segment | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) Segment TradeName Reportingunit | Jun. 30, 2023 USD ($) | Jun. 01, 2024 | Dec. 31, 2023 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Number of operating segments | Segment |  | 2 |  |  | 2 |  |  |
Number of reporting units | Reportingunit |  |  |  |  | 2 |  |  |
Amortization of intangibles |  |  | $ 10.9 | $ 11.0 | $ 21.5 | $ 21.9 |  |
Goodwill impairment | $ 127.5 |  | 127.5 |  | 127.5 |  |  |
Accumulated impairment losses |  |  | $ 530.8 |  | $ 530.8 |  |  | $ 403.3
Indefinite-lived intangibles, impairment charge | $ 37.7 |  |  |  |  |  |  |
Number of indefinite-lived trade names | TradeName |  |  |  |  | 3 |  |  |
Finite lived intangible asset useful life |  |  |  |  |  |  | 30 years |
ACCO Brands International |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  | $ 0.0 |  |  |

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