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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2013
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes related party transactions between OG&E and its affiliate, Enogex, during the three and six months ended June 30, 2013 and 2012.
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
(In millions)
2013
2012
2013
2012
Operating Revenues:
 
 
 
 
Electricity to power electric compression assets
$
2.1

$
2.9

$
3.9

$
5.7

Cost of Goods Sold:
 
 
 
 
Natural gas transportation services
$
8.7

$
8.7

$
17.4

$
17.4

Natural gas storage services
3.4

3.2

6.5

6.4

Natural gas purchases (A)
4.5

6.0

10.0

9.6

(A)
At June 30, 2013 and December 31, 2012, respectively, there were $1.2 million and $1.0 million of natural gas purchases recorded for these activities.