| **Goodwill And Identifiable Intangibles**                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| **Goodwill and Intangible Assets Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Goodwill And Identifiable Intangibles                    | 8. Goodwill and Identifiable Intangible AssetsGoodwillAs more fully described in the Company’s 2015 Annual Report on Form 10-K, we test goodwill for impairment at least annually and on an interim basis if an event or circumstance indicates that it is more likely than not that an impairment loss has been incurred. The Company performed this annual assessment, on a qualitative basis, as allowed by U.S. GAAP, in the second quarter of 2016 and concluded that no impairment existed.Changes in the net carrying amount of goodwill by segment were as follows:(in millions of dollars)ACCOBrandsNorth America ACCOBrandsInternational ComputerProductsGroup Total   Balance at December 31, 2015$377.5 $112.6 $6.8 $496.9Pelikan Artline acquisition (preliminary)— 84.3 — 84.3Translation3.6 13.8 — 17.4Balance at June 30, 2016$381.1 $210.7 $6.8 $598.6        Goodwill$512.0 $294.9 $6.8 $813.7Accumulated impairment losses(130.9) (84.2) — (215.1)Balance at June 30, 2016$381.1 $210.7 $6.8 $598.6Goodwill has been recorded on our balance sheet related to the PA Acquisition and represents the excess of the cost of the PA Acquisition when compared to the fair value estimate of the net assets acquired on May 2, 2016 (the date of the PA Acquisition). See Note 3. Acquisition, for details on the preliminary calculation of the goodwill acquired in the PA Acquisition.Identifiable Intangible AssetsThe identifiable intangible assets of $60.8 million acquired in the PA Acquisition include amortizable customer relationships and trade names and were recorded at their preliminary estimated fair values. We are continuing our review of our fair value estimate of assets acquired and liabilities assumed during the measurement period, which will conclude as soon as we receive the information we are seeking about facts and circumstances that existed as of the acquisition date, or learn that more information is not available. The values assigned were based on the estimated future discounted cash flows attributable to the assets. These future cash flows were estimated based on the historical cash flows and then adjusted for anticipated future changes, primarily expected changes in sales volume or price.Amortizable customer relationships and trade names are expected to be amortized over lives ranging from 12 to 30 years from the PA Acquisition date of May 2, 2016. The customer relationships will be amortized on an accelerated basis. The preliminary allocations of the acquired identifiable intangibles acquired in the PA Acquisition are as follows:(in millions of dollars)Estimated Fair Value Estimated Average Remaining Useful LifeCustomer relationships$37.8 12 YearsTrade names - amortizable23.0 12-30 YearsTotal identifiable intangibles acquired$60.8  The gross carrying value and accumulated amortization by class of identifiable intangible assets as of June 30, 2016 and December 31, 2015 were as follows: June 30, 2016 December 31, 2015(in millions of dollars)GrossCarryingAmounts AccumulatedAmortization NetBookValue GrossCarryingAmounts AccumulatedAmortization NetBookValueIndefinite-lived intangible assets:       Trade names$484.1 $(44.5)(1) $439.6 $471.8 $(44.5)(1) $427.3Amortizable intangible assets:       Trade names144.1 (64.9) 79.2 122.6 (61.7) 60.9Customer and contractual relationships133.7 (69.5) 64.2 95.8 (63.1) 32.7Subtotal277.8 (134.4) 143.4 218.4 (124.8) 93.6Total identifiable intangibles$761.9 $(178.9) $583.0 $690.2 $(169.3) $520.9(1)Accumulated amortization prior to the adoption of authoritative guidance on goodwill and indefinite-lived intangible assets, at which time further amortization ceased.The Company’s intangible amortization expense was $5.4 million and $4.9 million for the three months ended June 30, 2016 and 2015, respectively and $10.1 million and $10.1 million for the six months ended June 30, 2016 and 2015, respectively.Estimated amortization expense for amortizable intangible assets as of June 30, 2016 for the current year and the next five years are as follows:(in millions of dollars)2016 2017 2018 2019 2020 2021Estimated amortization expense(1)$21.6 $20.4 $17.8 $15.2 $12.6 $10.1(1)Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.We test indefinite-lived intangibles for impairment at least annually and on an interim basis if an event or circumstance indicates that it is more likely than not that an impairment loss has been incurred. We performed this annual assessment, on a qualitative basis, as allowed by U.S. GAAP, for the majority of indefinite-lived trade names in the second quarter of 2016 and concluded that no impairment existed. For two of our indefinite-lived trade names that are not substantially above their carrying values, Mead® and Hilroy®, we performed quantitative tests (Step 1) in the second quarter of 2016. The following long-term growth rates and discount rates were used, 1.5% and 10.0% for Mead® and 1.5% and 10.5% for Hilroy®, respectively. We concluded that neither Mead® nor Hilroy® were impaired.In the fourth quarter of 2015 we performed a quantitative test, as we identified the recession in Brazil as a triggering event related to our trade name, Tilibra®, primarily used in Brazil. While we concluded that no impairment existed, the trade name's fair value has been significantly reduced. Key financial assumptions utilized to determine the fair value of Tilibra® included a long-term growth rate of 6.5% and a 14.5% discount rate. In 2016, the Tilibra® trade name is performing in line with the forecast used in the fourth quarter of 2015 quantitative test; however, the economic conditions in Brazil could deteriorate further triggering additional future reviews.The fair values of Mead®, Tilibra® and Hilroy® trade names are less than 30% above their carrying values. As of June 30, 2016 the carrying values of those trade names were as follows: Mead® ($113.3 million), Tilibra® ($63.4 million) and Hilroy® ($12.3 million). |

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| - Definition
The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final.  May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.
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