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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table summarizes the activity of OG&E's stock-based compensation during the three months ended March 31, 2017.
 
Units/Shares
Fair Value
Per Share
Grants
 
 
Performance units (Total shareholder return)
85,501

$
41.76

Performance units (Earnings per share)
28,499

$
34.95
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, 2017 and 2016 related to performance units and restricted stock for OG&E employees.
 
Three Months Ended March 31,
(In millions)
2017
2016
Performance units
 
 
Total shareholder return
$
0.6

$
0.6

Earnings per share
0.2

0.2

Total performance units
0.8

0.8

Restricted stock
—

—

Total compensation expense
$
0.8

$
0.8

Income tax benefit
$
0.3

$
0.3