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Related Party Disclosures (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2021 and 2020.
Three Months EndedNine Months Ended
September 30,September 30,
(In millions)2021202020212020
Operating revenues:
Electricity to power electric compression assets$4.1 $4.5 $10.0 $11.7 
Fuel, purchased power and direct transmission expense:
Natural gas transportation services$9.4 $9.3 $23.4 $23.4 
Natural gas purchases (sales)$(7.7)$3.2 $(28.3)$2.2