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Guarantees (Tables)
9 Months Ended
Sep. 30, 2011
Guarantees (Tables) [Abstract] 
Schedule of Guarantor Obligations [Table Text Block]

 
Maximum Potential
 
 
 
 
 
Future Payments
 
Outstanding
 
Liability Recorded
 
(Millions of Dollars)
Guarantees
$
2.8

 
$
0.1

 
$

Letters of Credit
$
1.6

 
$
0.7

 
$