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Quarterly Financial Data
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Data [Abstract]  
Quarterly Financial Information [Text Block]
Quarterly Financial Data (Unaudited)

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
2015
$
480.1

$
549.9

$
719.8

$
447.1

$
2,196.9

 
2014
$
560.4

$
611.8

$
754.7

$
526.2

$
2,453.1

Operating income
2015
$
57.3

$
127.5

$
255.7

$
59.9

$
500.4

 
2014
$
61.8

$
142.2

$
248.4

$
85.6

$
538.0

Net income
2015
$
17.1

$
69.0

$
162.9

$
19.9

$
268.9

 
2014
$
20.7

$
76.9

$
157.3

$
37.1

$
292.0