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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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 nine months ended September 30, 2016 and 2015 related to performance units and restricted stock for OG&E employees.
 
Three Months Ended September 30,
Nine Months Ended September 30,
(In millions)
2016
2015
2016
2015
Performance units
 
 
 
 
Total shareholder return
$
0.5

$
0.6

$
1.5

$
1.9

Earnings per share
(0.4
)
(0.2
)
—

0.2

Total performance units
0.1

0.4

1.5

2.1

Restricted stock
—

—

—

0.1

Total compensation expense
$
0.1

$
0.4

$
1.5

$
2.2

Income tax benefit
$
—

$
0.2

$
0.5

$
0.9