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Accounting for Asset Retirement Obligations (Tables)
9 Months Ended
Oct. 02, 2011
Accounting for Asset Retirement Obligations [Abstract] 
Reconciliation of Asset Retirement Obligations
     The following is a reconciliation of asset retirement obligations as of October 2, 2011:

(millions of dollars)
     
Asset retirement liability, December 31, 2010
$
14.7
 
Accretion expense                                                                       
 
0.5
 
Additional  obligations                                                                       
 
0.2
 
Reversal of obligations                                                                       
 
(0.4
)
Payments
 
(0.2
)
Asset retirement liability,  October 2, 2011                                                                       
$
14.8