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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
Due to the seasonal fluctuations and other factors of OG&E's business, the operating results for interim periods are not necessarily indicative of the results that may be expected for the year. In OG&E's opinion, the following quarterly financial data includes all adjustments, consisting of normal recurring adjustments, necessary to fairly present such amounts. Summarized quarterly unaudited financial data is as follows:
Quarter ended (In millions)
 
March 31
June 30
September 30
December 31
Total
Operating revenues
2012
$
426.7

$
528.0

$
721.0

$
465.5

$
2,141.2

 
2011
$
422.1

$
568.7

$
774.8

$
445.9

$
2,211.5

Operating income
2012
$
39.8

$
127.8

$
258.0

$
63.8

$
489.4

 
2011
$
26.0

$
133.3

$
258.7

$
54.3

$
472.3

Net income
2012
$
12.1

$
73.4

$
167.2

$
27.6

$
280.3

 
2011
$
6.4

$
78.6

$
158.6

$
19.7

$
263.3