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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs 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, 2019 and 2018 related to OGE Energy's performance units and restricted stock for OG&E employees.
 
Three Months Ended March 31,
(In millions)
2019
2018
Performance units:
 
 
Total shareholder return
$
0.8

$
0.7

Earnings per share
0.1

0.2

Total performance units
0.9

0.9

Restricted stock
0.1

—

Total compensation expense
$
1.0

$
0.9

Income tax benefit
$
0.3

$
0.2