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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2020
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue [Table Text Block]
The following table disaggregates the Company's revenues from contracts with customers by customer classification. The Company's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" within "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."
Three Months Ended June 30,Six Months Ended June 30,
(In millions)2020201920202019
Residential$202.8  $182.3  $369.7  $373.5  
Commercial113.0  115.4  204.3  210.8  
Industrial44.7  52.9  86.2  105.2  
Oilfield38.4  48.9  76.6  98.3  
Public authorities and street light40.6  44.4  75.3  84.5  
   System sales revenues439.5  443.9  812.1  872.3  
Provision for rate refund(1.0) (0.5) (1.6) (0.6) 
Integrated market8.5  10.3  15.7  17.0  
Transmission39.8  39.8  74.0  75.9  
Other5.2  7.6  12.2  13.9  
Revenues from contracts with customers$492.0  $501.1  $912.4  $978.5