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Common Equity (Tables)
 6 Months Ended
Jun. 30, 2014
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 except per share data)
2014
2013
2014
2013
Net Income Attributable to OGE Energy
$
100.8

$
91.7

$
150.1

$
114.8

Average Common Shares Outstanding
 
 
 
 
Basic average common shares outstanding
199.2

198.3

199.0

198.0

Effect of dilutive securities:
 
 
 
 
Contingently issuable shares (performance units)
0.8

1.1

0.8

1.1

Diluted average common shares outstanding
200.0

199.4

199.8

199.1

Basic Earnings Per Average Common Share Attributable to OGE Energy Common Shareholders
$
0.51

$
0.46

$
0.75

$
0.58

Diluted Earnings Per Average Common Share Attributable to OGE Energy Common Shareholders
$
0.50

$
0.46

$
0.75

$
0.58

Anti-dilutive shares excluded from earnings per share calculation
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