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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]
Quarterly Financial Data (Unaudited)

Due to the seasonal fluctuations and other factors of the Company's businesses, the operating results for interim periods are not necessarily indicative of the results that may be expected for the year. In the Company's opinion, the following quarterly financial data includes all adjustments, consisting of normal recurring adjustments, necessary to fairly present such amounts. Summarized consolidated quarterly unaudited financial data is as follows:
Quarter ended (In millions, except per share data)
 
March 31
June 30
September 30
December 31
Total
Operating revenues
2014
$
560.4

$
611.8

$
754.7

$
526.2

$
2,453.1

 
2013
$
901.4

$
734.2

$
723.2

$
508.9

$
2,867.7

Operating income
2014
$
61.8

$
141.8

$
248.1

$
85.1

$
536.8

 
2013
$
75.4

$
143.9

$
260.9

$
73.3

$
553.5

Net income
2014
$
49.3

$
100.8

$
187.3

$
58.4

$
395.8

 
2013
$
28.0

$
93.0

$
215.2

$
57.6

$
393.8

Net income attributable to OGE Energy
2014
$
49.3

$
100.8

$
187.3

$
58.4

$
395.8

 
2013
$
23.1

$
91.7

$
215.2

$
57.6

$
387.6

Basic earnings per average common share attributable to OGE Energy common shareholders (A)
2014
$
0.25

$
0.51

$
0.94

$
0.29

$
1.99

 
2013
$
0.12

$
0.46

$
1.08

$
0.29

$
1.96

Diluted earnings per average common share attributable to OGE Energy common shareholders (A)
2014
$
0.25

$
0.50

$
0.94

$
0.29

$
1.98

 
2013
$
0.12

$
0.46

$
1.08

$
0.29

$
1.94

(A)
Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.