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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2014
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
2014
$
560.4

$
611.8

$
754.7

$
526.2

$
2,453.1

 
2013
$
455.5

$
574.6

$
723.2

$
508.9

$
2,262.2

Operating income
2014
$
61.8

$
142.2

$
248.4

$
85.6

$
538.0

 
2013
$
52.9

$
138.1

$
261.0

$
73.3

$
525.3

Net income
2014
$
20.7

$
76.9

$
157.3

$
37.1

$
292.0

 
2013
$
13.0

$
79.0

$
171.5

$
29.1

$
292.6