| **Information On Business Segments (Net Sales by Segment) (Details) $ in Millions** | 3 Months Ended | 9 Months Ended |
|-------------------------------------------------------------------------------------|----------------|----------------|
||
| **Segment Reporting Information [Line Items]**                                      |           |           |   |   |
| Number of business segments | segment                                               |           |           | 3 |   |
| Net sales                                                                           | $ 532.2        | $ 431.3        | $ 1,382.0 | $ 1,119.5 |
| Operating Segment | ACCO Brands North America                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                      |           |           |   |   |
| Net sales                                                                           | 290.3          | 289.1          | 745.8 | 763.8 |
| Operating Segment | ACCO Brands EMEA                                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                      |           |           |   |   |
| Net sales                                                                           | 140.3          | 40.7           | 365.3 | 120.9 |
| Operating Segment | ACCO Brands International                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                      |           |           |   |   |
| Net sales                                                                           | $ 101.6        | $ 101.5        | $ 270.9 | $ 234.8 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688
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| X                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                              |
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| X                                                                                                                                                      |
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| X                                                                                                                                                               |
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