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Accounting for Asset Retirement Obligations (Tables)
 3 Months Ended
Apr. 01, 2012
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of Asset Retirement Obligations
   The following is a reconciliation of asset retirement obligations as of April 1, 2012:

(millions of dollars)
     
       
Asset retirement liability, December 31, 2011
$
14.7
 
Accretion expense                                                                       
 
0.2
 
Payments                                                                       
 
(0.1
)
Foreign currency translation and other                                                                       
 
0.3
 
Asset retirement liability,  April 1, 2012                                                                       
$
15.1