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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following table summarizes OG&E's pre-tax compensation expense and related income tax benefit during the three and six months ended June 30, 2013 and 2012 related to performance units and restricted stock for OG&E employees.
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
(In millions)
2013
2012
2013
2012
Performance units
 
 
 
 
Total shareholder return
$
0.4

$
0.5

$
0.9

$
0.9

Earnings per share
0.1

0.1

0.3

0.3

Total compensation expense
$
0.5

$
0.6

$
1.2

$
1.2

Income tax benefit
$
0.2

$
0.2

$
0.5

$
0.5