Common Equity (Tables)

12 Months Ended

Dec. 31, 2011

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:

(In millions)	2011		2010		2009
Net Income Attributable to OGE Energy	$	342.9	$	295.3	$	258.3
Average Common Shares Outstanding
Basic average common shares outstanding	97.9		97.3		96.2
Effect of dilutive securities:
Contingently issuable shares (performance units)	1.3		1.6		1.0
Diluted average common shares outstanding	99.2		98.9		97.2
Basic Earnings Per Average Common Share
Attributable to OGE Energy Common Shareholders	$	3.50	$	3.03	$	2.68
Diluted Earnings Per Average Common Share
Attributable to OGE Energy Common Shareholders	$	3.45	$	2.99	$	2.66
Anti-dilutive shares excluded from earnings per share calculation	—		—		—