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

(millions of dollars)
     
Asset retirement liability, December 31, 2011
$
14.7
 
Accretion expense                                                                       
 
0.4
 
Payments                                                                       
 
(0.2
)
Foreign currency translation                                                                       
 
(0.1
)
Asset retirement liability,  July 1, 2012                                                                       
$
14.8