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Noncontrolling Interests (Tables)
 6 Months Ended
Jun. 30, 2012
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 six months ended June 30, 2012.
(In millions)
OGE Holdings Portion
ArcLight group's Portion
Total Distribution

First quarter 2012
$
24.4

$
5.6

$
30.0

Second quarter 2012
10.1

2.4

12.5

Total
$
34.5

$
8.0

$
42.5