| **Information On Business Segments (Operating Income by Segment) (Details) (USD $)In Millions, unless otherwise specified**                                                                                                                                                                                                                                                                 | 3 Months Ended | 9 Months Ended |
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| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                              |           |                |   |  |   |  |   |  |
| Operating income                                                                                                                                                                                                                                                                                                                                                                            | $ 61.8         | [1]            | $ 50.3 | [1] | $ 105.1 | [1] | $ 79.0 | [1] |
| Interest expense                                                                                                                                                                                                                                                                                                                                                                            | 12.5           |                | 13.9 |  | 37.0 |  | 45.3 |  |
| Interest income                                                                                                                                                                                                                                                                                                                                                                             | (1.6)          |                | (1.4) |  | (4.7) |  | (3.6) |  |
| Equity in earnings of joint ventures                                                                                                                                                                                                                                                                                                                                                        | (2.9)          |                | (3.3) |  | (5.3) |  | (5.9) |  |
| Other expense, net                                                                                                                                                                                                                                                                                                                                                                          | 0.2            |                | 0.1 |  | 0.3 |  | 9.6 |  |
| Income from continuing operations before income tax                                                                                                                                                                                                                                                                                                                                         | 53.6           |                | 41.0 |  | 77.8 |  | 33.6 |  |
| Corporate                                                                                                                                                                                                                                                                                                                                                                                   |           |                |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                              |           |                |   |  |   |  |   |  |
| Operating income                                                                                                                                                                                                                                                                                                                                                                            | (10.5)         | [1],[2]        | (7.0) | [1],[2] | (29.8) | [1],[2] | (24.0) | [1],[2] |
| Segment operating income                                                                                                                                                                                                                                                                                                                                                                    |           |                |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                              |           |                |   |  |   |  |   |  |
| Operating income                                                                                                                                                                                                                                                                                                                                                                            | 72.3           | [1]            | 57.3 | [1] | 134.9 | [1] | 103.0 | [1] |
| ACCO Brands North America                                                                                                                                                                                                                                                                                                                                                                   |           |                |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                              |           |                |   |  |   |  |   |  |
| Operating income                                                                                                                                                                                                                                                                                                                                                                            | 50.5           | [1]            | 36.1 | [1] | 98.0 | [1] | 61.6 | [1] |
| ACCO Brands International                                                                                                                                                                                                                                                                                                                                                                   |           |                |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                              |           |                |   |  |   |  |   |  |
| Operating income                                                                                                                                                                                                                                                                                                                                                                            | 19.1           | [1]            | 17.8 | [1] | 31.9 | [1] | 32.3 | [1] |
| Computer Products Group                                                                                                                                                                                                                                                                                                                                                                     |           |                |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                              |           |                |   |  |   |  |   |  |
| Operating income                                                                                                                                                                                                                                                                                                                                                                            | $ 2.7          | [1]            | $ 3.4 | [1] | $ 5.0 | [1] | $ 9.1 | [1] |
|                                                                                                                                                                                                                                                                                                                                                                                             |
| [1]Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less advertising, selling, general and administrative expenses; iv) less amortization of intangibles; and v) less restructuring charges.[2]The increase in corporate expense was the result of various strategic initiatives and higher management incentives. |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.
+ References
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| - Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
+ References
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| X                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest income earned from interest bearing assets not separately disclosed.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net result for the period of deducting operating expenses from operating revenues.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| - Definition
The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.
+ References
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| X                                                                                                                                                                        |
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