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Accounting for Asset Retirement Obligations (Tables)
 9 Months Ended
Oct. 01, 2017
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of asset retirement obligations
The following is a reconciliation of asset retirement obligations as of October 1, 2017:

    
  
(millions of dollars)
 
Asset retirement liability, December 31, 2016
 
$
21.5
 
Accretion expense
  
2.4
 
Payments
  
(1.8
)
Foreign currency translation
  
(0.4)
 
Asset retirement liability,  October 1, 2017
 
$
22.5