Common Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table presents the calculation of basic and diluted earnings (loss) per share for OGE Energy.

(In millions except per share data)	2021		2020		2019
Net income (loss)	$	737.3	$	(173.7)	$	433.6
Average common shares outstanding:
Basic average common shares outstanding	200.1		200.1		200.1
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)	0.2		—		0.6
Diluted average common shares outstanding	200.3		200.1		200.7
Basic earnings (loss) per average common share	$	3.68	$	(0.87)	$	2.17
Diluted earnings (loss) per average common share	$	3.68	$	(0.87)	$	2.16
Anti-dilutive shares excluded from earnings per share calculation	—		0.3		—