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Accounting for Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 29, 2015
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of asset retirement obligations
The following is a reconciliation of asset retirement obligations as of March 29, 2015:

  
(millions of dollars)
 
Asset retirement liability, December 31, 2014
 
$
23.0
 
Accretion expense
  
0.4
 
Reversals
  
(0.1
)
Payments
  
(0.3
)
Foreign currency translation
  
(0.3
)
Asset retirement liability,  March 29, 2015
 
$
22.7