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Accounting for Asset Retirement Obligations (Tables)
 6 Months Ended
Jul. 03, 2011
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of Asset Retirement Obligations
   The following is a reconciliation of asset retirement obligations as of July 3, 2011:

(millions of dollars)
     
Asset retirement liability, December 31, 2010
$
14.7
 
Accretion expense                                                                       
 
0.3
 
Reversal of obligation                                                                       
 
(0.3
)
Payments                                                                       
 
(0.2
)
Foreign currency translation                                                                       
 
0.3
 
Asset retirement liability,  July 3, 2011                                                                       
$
14.8