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Related Party Disclosures (Tables)
 6 Months Ended
Jun. 30, 2021
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block] The following table presents summarized related party transactions between OG&E and Enable during the three and six months ended June 30, 2021 and 2020.
Three Months EndedSix Months Ended
June 30,June 30,
(In millions)2021202020212020
Operating revenues:
Electricity to power electric compression assets$3.3 $3.5 $5.9 $7.2 
Fuel, purchased power and direct transmission expense:
Natural gas transportation services$9.3 $9.4 $14.0 $14.1 
Natural gas purchases (sales)$(8.4)$(1.7)$(20.6)$(1.0)