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Revenue from Contracts with Customers (Notes)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block] Revenue Recognition
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 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."
Year Ended December 31,
(In millions)20192018
Residential$865.8  $877.8  
Commercial486.6  500.0  
Industrial217.8  228.9  
Oilfield200.4  190.4  
Public authorities and street light190.3  197.4  
   System sales revenues1,960.9  1,994.5  
Provision for rate refund(0.9) (6.0) 
Integrated market38.4  48.7  
Transmission148.0  147.4  
Other29.1  27.1  
Revenues from contracts with customers$2,175.5  $2,211.7