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Common Equity (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Basic and diluted earnings per share for the Company were calculated as follows:
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
(In millions)
2013
2012
2013
2012
Net Income Attributable to OGE Energy
$
91.7

$
93.9

$
114.8

$
131.0

Average Common Shares Outstanding
 
 
 
 
Basic average common shares outstanding
198.3

197.2

198.0

196.8

Effect of dilutive securities:
 
 
 
 
Contingently issuable shares (performance units)
1.1

0.6

1.1

0.8

Diluted average common shares outstanding
199.4

197.8

199.1

197.6

Basic Earnings Per Average Common Share Attributable to OGE Energy Common Shareholders
$
0.46

$
0.48

$
0.58

$
0.66

Diluted Earnings Per Average Common Share Attributable to OGE Energy Common Shareholders
$
0.46

$
0.47

$
0.58

$
0.66

Anti-dilutive shares excluded from earnings per share calculation
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