Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

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

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

The following table summarizes OG&E's pre-tax compensation expense and related income tax benefit during the three months ended March 31, 2020 and 2019 related to OGE Energy's performance units and restricted stock units for OG&E employees.

	Three Months Ended March 31,
(In millions)	2020		2019
Performance units:
Total shareholder return	$	0.7	$	0.8
Earnings per share	0.1		0.1
Total performance units	0.8		0.9
Restricted stock units	0.1		0.1
Total compensation expense	$	0.9	$	1.0
Income tax benefit	$	0.2	$	0.3