Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

The following table presents the Registrants' pre-tax compensation expense and related income tax benefit for the three and nine months ended September 30, 2021 and 2020 related to performance units and restricted stock units for the Registrants' employees.

	OGE Energy								OG&E
	Three Months Ended September 30,				Nine Months Ended September 30,				Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020		2021		2020		2021		2020
Performance units:
Total shareholder return	$	1.9	$	1.9	$	5.8	$	5.6	$	0.5	$	0.5	$	1.4	$	1.8
Earnings per share	—		0.2		—		0.5		—		—		—		0.1
Total performance units	1.9		2.1		5.8		6.1		0.5		0.5		1.4		1.9
Restricted stock units	0.4		0.3		1.3		0.6		0.1		0.1		0.2		0.3
Total compensation expense	$	2.3	$	2.4	$	7.1	$	6.7	$	0.6	$	0.6	$	1.6	$	2.2
Income tax benefit	$	0.6	$	0.6	$	1.8	$	1.7	$	0.1	$	0.2	$	0.4	$	0.6