| **Goodwill and Identifiable Intangibles (Goodwill) (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |         |
|----------------------------------------------------------------------------------------|----------------|-----------------|---------|
||
| **Goodwill [Roll Forward]**                                                            |           |            |    |   |
| Beginning Balance                                                                      |           | $ 496.9         | $ 544.9 |   |
| Goodwill, Purchase Accounting Adjustments                                              |           | 80.5            |    |   |
| Translation                                                                            |           | 9.7             | (48.0)  |   |
| Ending Balance                                                                         |           | 587.1           | 496.9   |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Goodwill                                                                               |           |            |    | $ 802.2 |
| Accumulated impairment losses                                                          |           |            |    | (215.1) |
| Goodwill                                                                               |           | 496.9           | 544.9   | 587.1 |
| Goodwill, Impairment Loss                                                              | $ 0.0          |            |    |   |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)                 | 0.0            |            |    |   |
| ACCO Brands North America                                                              |           |            |    |   |
| **Goodwill [Roll Forward]**                                                            |           |            |    |   |
| Beginning Balance                                                                      |           | 377.5           | 387.6   |   |
| Goodwill, Purchase Accounting Adjustments                                              |           | 0.0             |    |   |
| Translation                                                                            |           | 1.5             | (10.1)  |   |
| Ending Balance                                                                         |           | 379.0           | 377.5   |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Goodwill                                                                               |           |            |    | 509.9 |
| Accumulated impairment losses                                                          |           |            |    | (130.9) |
| Goodwill                                                                               |           | 377.5           | 387.6   | 379.0 |
| ACCO Brands International                                                              |           |            |    |   |
| **Goodwill [Roll Forward]**                                                            |           |            |    |   |
| Beginning Balance                                                                      |           | 112.6           | 150.5   |   |
| Goodwill, Purchase Accounting Adjustments                                              |           | 80.5            |    |   |
| Translation                                                                            |           | 8.2             | (37.9)  |   |
| Ending Balance                                                                         |           | 201.3           | 112.6   |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Goodwill                                                                               |           |            |    | 285.5 |
| Accumulated impairment losses                                                          |           |            |    | (84.2) |
| Goodwill                                                                               |           | 112.6           | 150.5   | 201.3 |
| Computer Products Group                                                                |           |            |    |   |
| **Goodwill [Roll Forward]**                                                            |           |            |    |   |
| Beginning Balance                                                                      |           | 6.8             | 6.8     |   |
| Goodwill, Purchase Accounting Adjustments                                              |           | 0.0             |    |   |
| Translation                                                                            |           | 0.0             | 0.0     |   |
| Ending Balance                                                                         |           | 6.8             | 6.8     |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Goodwill                                                                               |           |            |    | 6.8 |
| Accumulated impairment losses                                                          |           |            |    | 0.0 |
| Goodwill                                                                               |           | $ 6.8           | $ 6.8   | $ 6.8 |
| Mead Trade Name                                                                        |           |            |    |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)                 | 0.0            |            |    |   |
| Maximum Percent Above Carrying Value                                                   |           |            |    | 30.00% |
| Hilroy Trade Name                                                                      |           |            |    |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)                 | $ 0.0          |            |    |   |
| Maximum Percent Above Carrying Value                                                   |           |            |    | 30.00% |
| Customer and contractual relationships | Pelikan Artline Pty Ltd                       |           |            |    |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Finite-Lived Intangible Asset, Useful Life                                             |           | 12 years        |    |   |
| Minimum | Trade Names | Pelikan Artline Pty Ltd                                        |           |            |    |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Finite-Lived Intangible Asset, Useful Life                                             |           | 12 years        |    |   |
| Maximum | Trade Names | Pelikan Artline Pty Ltd                                        |           |            |    |   |
| **Goodwill, Impaired, Accumulated Impairment Loss**                                    |           |            |    |   |
| Finite-Lived Intangible Asset, Useful Life                                             |           | 30 years        |    |   |

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.
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