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Goodwill and Identifiable Intangible Assets (Goodwill) (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2021 USD ($) reportingUnit | Dec. 17, 2020 USD ($) reportingUnit | Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2016 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Number of reporting units | reportingUnit | 3 | 3 |  |  |
Goodwill, accumulated impairment losses | $ 0.0 |  |  |  | $ 215.1
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  |  |  | $ 827.4 |
Acquisitions |  |  |  | (16.2) |
Foreign currency translation |  |  |  | (3.9) |
Balance at June 30, 2021 |  |  | $ 807.3 | 807.3 |
PowerA |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at June 30, 2021 |  | $ 67.4 |  |  |
Working capital adjustment |  |  | 18.2 |  |
ACCO Brands North America |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  |  |  | 461.2 |
Acquisitions |  |  |  | (18.2) |
Foreign currency translation |  |  |  | 0.0 |
Balance at June 30, 2021 |  |  | 443.0 | 443.0 |
ACCO Brands EMEA |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  |  |  | 188.2 |
Acquisitions |  |  |  | 2.0 |
Foreign currency translation |  |  |  | (4.4) |
Balance at June 30, 2021 |  |  | 185.8 | 185.8 |
ACCO Brands International |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2020 |  |  |  | 178.0 |
Acquisitions |  |  |  | 0.0 |
Foreign currency translation |  |  |  | 0.5 |
Balance at June 30, 2021 |  |  | $ 178.5 | $ 178.5 |

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