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Accounting for Asset Retirement Obligations (Tables)
 6 Months Ended
Jul. 03, 2016
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of asset retirement obligations
The following is a reconciliation of asset retirement obligations as of July 3, 2016:

  
(millions of dollars)
 
Asset retirement liability, December 31, 2015
 
$
21.4
 
Accretion expense
  
1.6
 
Reversals
  
(0.5
)
Payments
  
(0.7
)
Foreign currency translation
  
(0.3
)
Asset retirement liability,  July 3, 2016
 
$
21.5