|**Goodwill And Identifiable Intangibles (Tables)**                                           | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|**Finite-Lived Intangible Assets [Line Items]**                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Changes in Net Carrying Amount of Goodwill by Segment                                        | Changes in the net carrying amount of goodwill by segment were as follows:(in millions)ACCOBrandsNorth AmericaACCOBrandsEMEAACCOBrandsInternationalTotalBalance at December 31, 2018$375.6$165.6$167.7$708.9GOBA Acquisition——0.30.3Foreign currency translation—(1.0)0.1(0.9)Balance at June 30, 2019$375.6$164.6$168.1$708.3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|(in millions)                                                                                | ACCOBrandsNorth America                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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|Balance at December 31, 2018                                                                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|GOBA Acquisition                                                                             | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Foreign currency translation                                                                 | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Balance at June 30, 2019                                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Gross Carrying Value and Accumulated Amortization by Class of Identifiable Intangible Assets | The gross carrying value and accumulated amortization by class of identifiable intangible assets as ofJune 30, 2019andDecember 31, 2018was as follows:June 30, 2019December 31, 2018(in millions)GrossCarryingAmountsAccumulatedAmortizationNetBookValueGrossCarryingAmountsAccumulatedAmortizationNetBookValueIndefinite-lived intangible assets:Trade names$471.8$(44.5)(1)$427.3$471.7$(44.5)(1)$427.2Amortizable intangible assets:Trade names307.1(77.3)229.8306.0(70.5)235.5Customer and contractual relationships242.5(132.1)110.4240.2(120.5)119.7Patents5.5(1.2)4.35.5(0.9)4.6Subtotal555.1(210.6)344.5551.7(191.9)359.8Total identifiable intangibles$1,026.9$(255.1)$771.8$1,023.4$(236.4)$787.0(1)Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.
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|                                                                                             | June 30, 2019                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|(in millions)                                                                                | GrossCarryingAmounts                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Indefinite-lived intangible assets:                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Trade names                                                                                  | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Amortizable intangible assets:                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Trade names                                                                                  | 307.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Customer and contractual relationships                                                       | 242.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Patents                                                                                      | 5.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Subtotal                                                                                     | 555.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Total identifiable intangibles                                                               | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|(1)                                                                                          | Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Estimated Amortization Expense for Future Periods                                            | Estimated amortization expense for amortizable intangible assets as ofJune 30, 2019for the current year and the next five years are as follows:(in millions)201920202021202220232024Estimated amortization expense(2)$35.5$31.9$28.3$24.7$22.4$20.8(2)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.                                                                                                                                                                                                                                                                                                                                              
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|(in millions)                                                                                | 2019                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Estimated amortization expense(2)                                                            | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Cumberland Asset Acquisition                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|**Finite-Lived Intangible Assets [Line Items]**                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Schedule of Acquired Finite-Lived Intangible Assets by Major Class                           | The allocation of the identifiable intangibles acquired in the Cumberland Asset Acquisition was as follows:(in millions)Fair ValueRemaining Useful Life RangesTrade name - amortizable$0.810 YearsCustomer relationships2.47 YearsTotal identifiable intangibles acquired$3.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|(in millions)                                                                                | Fair Value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Trade name - amortizable                                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Customer relationships                                                                       | 2.4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total identifiable intangibles acquired                                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|GOBA Internacional, SA de CV                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|**Finite-Lived Intangible Assets [Line Items]**                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Schedule of Acquired Finite-Lived Intangible Assets by Major Class                           | The allocation of the identifiable intangibles acquired in the GOBA Acquisition was as follows:(in millions)Fair ValueRemaining Useful Life RangesTrade name - amortizable$3.815 YearsCustomer relationships6.510 YearsTotal identifiable intangibles acquired$10.3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|(in millions)                                                                                | Fair Value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Trade name - amortizable                                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Customer relationships                                                                       | 6.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total identifiable intangibles acquired                                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

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