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Accounting for Asset Retirement Obligations (Tables)
 6 Months Ended
Jul. 02, 2017
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of asset retirement obligations
The following is a reconciliation of asset retirement obligations as of July 2, 2017:
 
  
(millions of dollars)
 
Asset retirement liability, December 31, 2016
 
$
21.5
 
Accretion expense
  
1.7
 
Payments
  
(0.7
)
Foreign currency translation
  
0.2
 
Asset retirement liability,  July 2, 2017
 
$
22.7