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Accounting for Asset Retirement Obligations (Tables)
3 Months Ended
Apr. 01, 2018
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of asset retirement obligations
The following is a reconciliation of asset retirement obligations as of April 1, 2018:

  
(millions of dollars)
 
Asset retirement liability, December 31, 2017
 
$
22.1
 
Accretion expense
  
0.1
 
Other
  
(1.1
)
Payments
  
(0.6
)
Foreign currency translation
  
0.1
 
Asset retirement liability,  April 1, 2018
 
$
20.6