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Quarterly Financial Data
 12 Months Ended
Dec. 31, 2016
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
2016
$
433.1

$
551.4

$
743.9

$
530.8

$
2,259.2

 
2015
$
480.1

$
549.9

$
719.8

$
447.1

$
2,196.9

Operating income
2016
$
38.6

$
131.4

$
257.2

$
81.7

$
508.9

 
2015
$
57.3

$
127.5

$
255.7

$
59.9

$
500.4

Net income
2016
$
6.1

$
72.3

$
159.9

$
45.8

$
284.1

 
2015
$
17.1

$
69.0

$
162.9

$
19.9

$
268.9