Common Equity (Tables)

3 Months Ended

Mar. 31, 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
	March 31,
(In millions)	2013		2012
Net Income Attributable to OGE Energy	$	23.1	$	37.1
Average Common Shares Outstanding
Basic average common shares outstanding	98.9		98.3
Effect of dilutive securities:
Contingently issuable shares (performance units)	0.5		0.5
Diluted average common shares outstanding	99.4		98.8
Basic Earnings Per Average Common Share Attributable to OGE Energy Common Shareholders	$	0.23	$	0.38
Diluted Earnings Per Average Common Share Attributable to OGE Energy Common Shareholders	$	0.23	$	0.38
Anti-dilutive shares excluded from earnings per share calculation	—		—