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Noncontrolling Interests (Tables)
 3 Months Ended
Mar. 31, 2013
Noncontrolling Interest [Abstract]  
Schedule of Distributions Made to Members or Limited Partners, by Distribution [Table Text Block]
The following table summarizes the quarterly distributions during the three months ended March 31, 2013.
(In millions)
OGE Holdings' Portion
ArcLight group's Portion
Total Distribution

First quarter 2013
$
10.0

$
2.5

$
12.5