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Accounting for Asset Retirement Obligations (Tables)
 6 Months Ended
Jul. 01, 2018
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of Asset Retirement Obligations
The following is a reconciliation of asset retirement obligations as of July 1, 2018:
 
  
(millions of dollars)
 
Asset retirement liability, December 31, 2017
 
$
22.1
 
Accretion expense
  
0.6
 
Other
  
(1.6
)
Payments
  
(0.7
)
Foreign currency translation
  
(0.3
)
Asset retirement liability,  July 1, 2018
 
$
20.1