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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Stock-Based Compensation

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, 2018 and 2017 related to OGE Energy performance units and restricted stock for OG&E employees.
 
Three Months Ended June 30,
Six Months Ended June 30,
(In millions)
2018
2017
2018
2017
Performance units:
 
 
 
 
Total shareholder return
$
0.8

$
0.7

$
1.5

$
1.3

Earnings per share
0.4

0.3

0.6

0.5

Total performance units
1.2

1.0

2.1

1.8

Restricted stock
—

—

—

—

Total compensation expense
$
1.2

$
1.0

$
2.1

$
1.8

Income tax benefit
$
0.3

$
0.4

$
0.5

$
0.7



During the three and six months ended June 30, 2018, OGE Energy issued an immaterial number of shares of new common stock to OG&E employees pursuant to OGE Energy's Stock Incentive Plan to satisfy restricted stock grants and payouts of earned performance units.