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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill and Other Intangible Assets [Abstract]  
Acquired intangible assets subject to amortization
     Acquired intangible assets subject to amortization included in other assets and deferred charges as of December 31, 2012 and December 31, 2011 was as follows:

 
December 31, 2012
 
December 31, 2011
(Millions of Dollars)
 
Gross
Carrying
Amount
 
 
 
Accumulated
Amortization
 
 
 
Gross
Carrying
Amount
 
 
 
Accumulated
Amortization
 
Patents and trademarks                                                      
$
6.2
 
 
$
4.3
 
 
$
6.2
 
 
$
4.0
 
Customer lists                                                      
 
2.7
 
 
 
1.5
 
 
 
2.7
 
 
 
1.5
 
 
$
8.9
 
 
$
5.8
 
 
$
8.9
 
 
$
5.5