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Stock-Based Compensation
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement [Text Block] Stock-Based Compensation The following table presents the Registrants' pre-tax compensation expense and related income tax benefit for the three and six months ended June 30, 2021 and 2020 related to performance units and restricted stock units for the Registrants' employees.
OGE EnergyOG&E
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended June 30,Six Months Ended June 30,
(In millions)20212020202120202021202020212020
Performance units:  
Total shareholder return$1.9 $2.0 $3.9 $3.7 $0.5 $0.6 $0.9 $1.3 
Earnings per share 0.1  0.3  —  0.1 
Total performance units1.9 2.1 3.9 4.0 0.5 0.6 0.9 1.4 
Restricted stock units0.4 0.2 0.9 0.3 0.1 0.1 0.1 0.2 
Total compensation expense$2.3 $2.3 $4.8 $4.3 $0.6 $0.7 $1.0 $1.6 
Income tax benefit$0.6 $0.6 $1.2 $1.1 $0.2 $0.2 $0.3 $0.4 
During the six months ended June 30, 2021, OGE Energy issued 154,344 shares of its treasury stock to satisfy payouts of earned performance units and restricted stock unit grants to the Registrants' employees pursuant to OGE Energy's Stock Incentive Plan.