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Accounting for Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 30, 2014
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of Asset Retirement Obligations
The following is a reconciliation of asset retirement obligations as of March 30, 2014:

(millions of dollars)
   
     
Asset retirement liability, December 31, 2013
 $14.7 
Accretion expense                                                                       
  0.2 
Additions                                                                       
  -- 
Reversals                                                                       
  (0.1)
Foreign currency translation and other                                                                       
  -- 
Asset retirement liability,  March 30, 2014                                                                       
 $14.8