|**Accumulated Other Comprehensive Income (Loss) (Tables)**                          | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|**Equity [Abstract]**                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Schedule of Accumulated Other Comprehensive Income (Loss)                           | The components of, and changes in, accumulated other comprehensive income (loss) were as follows:(in millions of dollars)DerivativeFinancialInstrumentsForeignCurrencyAdjustmentsUnrecognizedPension and OtherPost-retirementBenefit CostsAccumulatedOtherComprehensiveIncome (Loss)Balance at December 31, 2015$0.8$(302.7)$(127.3)$(429.2)Other comprehensive income (loss) before reclassifications, net of tax—16.8(11.5)5.3Amounts reclassified from accumulated other comprehensive income (loss), net of tax1.7—2.84.5Balance at December 31, 20162.5(285.9)(136.0)(419.4)Other comprehensive loss before reclassifications, net of tax(3.6)(19.5)(23.4)(46.5)Amounts reclassified from accumulated other comprehensive income (loss), net of tax1.3—3.54.8Balance at December 31, 2017$0.2$(305.4)$(155.9)$(461.1)                                                                                                                                                                                                                                                                                           
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|(in millions of dollars)                                                            | DerivativeFinancialInstruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Balance at December 31, 2015                                                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Other comprehensive income (loss) before reclassifications, net of tax              | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 1.7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Balance at December 31, 2016                                                        | 2.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Other comprehensive loss before reclassifications, net of tax                       | (3.6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 1.3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Balance at December 31, 2017                                                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)  | The reclassifications out of accumulated other comprehensive income (loss) for the years endedDecember 31, 2017,2016and2015were as follows:Year Ended December 31,(in millions of dollars)201720162015Details about Accumulated Other Comprehensive Income ComponentsAmount Reclassified from Accumulated Other Comprehensive IncomeLocation on Income Statement(Loss) gain on cash flow hedges:Foreign exchange contracts$(1.6)$(2.4)$10.9Cost of products soldTax benefit (expense)0.30.7(3.2)Income tax (benefit) expenseNet of tax$(1.3)$(1.7)$7.7Defined benefit plan items:Amortization of actuarial loss$(4.6)$(3.1)$(3.6)(1)Amortization of prior service cost(0.4)(0.4)(0.1)(1)Total before tax(5.0)(3.5)(3.7)Tax benefit1.5$0.7$1.2Income tax (benefit) expenseNet of tax$(3.5)$(2.8)$(2.5)Total reclassifications for the period, net of tax$(4.8)$(4.5)$5.2(1)This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (income) for pension and post-retirement plans (See "Note 5. Pension and Other Retiree Benefits" for additional details).
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|(in millions of dollars)                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Details about Accumulated Other Comprehensive Income Components                     | Amount Reclassified from Accumulated Other Comprehensive Income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|(Loss) gain on cash flow hedges:                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Foreign exchange contracts                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Tax benefit (expense)                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Net of tax                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Defined benefit plan items:                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Amortization of actuarial loss                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Amortization of prior service cost                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Total before tax                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Tax benefit                                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Net of tax                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|Total reclassifications for the period, net of tax                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|(1)                                                                                 | This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (income) for pension and post-retirement plans (See "Note 5. Pension and Other Retiree Benefits" for additional details).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

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