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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
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 and six months ended June 30, 2017 and 2016 related to performance units and restricted stock for OG&E employees.
 
Three Months Ended June 30,
Six Months Ended June 30,
(In millions)
2017
2016
2017
2016
Performance units
 
 
 
 
Total shareholder return
$
0.7

$
0.4

$
1.3

$
1.0

Earnings per share
0.3

0.2

0.5

0.4

Total performance units
1.0

0.6

1.8

1.4

Restricted stock
—

—

—

—

Total compensation expense
$
1.0

$
0.6

$
1.8

$
1.4

Income tax benefit
$
0.4

$
0.2

$
0.7

$
0.5