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Related Party Disclosures (Tables)
 12 Months Ended
Dec. 31, 2020
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 years ended December 31, 2020, 2019 and 2018.
Year Ended December 31,
(In millions)202020192018
Operating revenues:
Electricity to power electric compression assets$15.1 $15.9 $16.3 
Cost of sales:
Natural gas transportation services$32.8 $41.2 $37.9 
Natural gas purchases (sales)$2.7 $(6.0)$(3.2)