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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2019
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 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



During the three months ended March 31, 2019, OGE Energy issued to OG&E employees 164,571 shares of new common stock pursuant to OGE Energy's Stock Incentive Plan to satisfy restricted stock grants and payouts of earned performance units.

During the three months ended March 31, 2019, OGE Energy granted 68,396 performance units (based on total shareholder return over a three-year period) and 26,141 restricted stock units (three-year cliff vesting period) to OG&E employees at $47.00 and $41.63 fair value per share, respectively.