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Quarterly Financial Data
 12 Months Ended
Dec. 31, 2017
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
2017
$
456.0

$
586.4

$
716.8

$
501.9

$
2,261.1

 
2016
$
433.1

$
551.4

$
743.9

$
530.8

$
2,259.2

Operating income
2017
$
44.2

$
143.9

$
243.0

$
80.6

$
511.7

 
2016
$
38.6

$
131.4

$
257.2

$
81.7

$
508.9

Net income
2017
$
16.2

$
86.2

$
161.5

$
41.6

$
305.5

 
2016
$
6.1

$
72.3

$
159.9

$
45.8

$
284.1