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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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 nine months ended September 30, 2012 and 2011 related to performance units and restricted stock for OG&E employees.
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2012
2011
2012
2011
Performance units
 
 
 
 
Total shareholder return
$
0.4

$
0.4

$
1.3

$
1.2

Earnings per share
0.2

0.2

0.5

0.8

Total performance units
0.6

0.6

1.8

2.0

Restricted stock
—

0.1

—

0.1

Total compensation expense
$
0.6

$
0.7

$
1.8

$
2.1

Income tax benefit
$
0.2

$
0.4

$
0.7

$
0.7