Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2018

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" in "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."

	September 30, 2018
(In millions)	Three Months Ended		Nine Months Ended
Residential	$	281.0	$	694.6
Commercial	174.7		444.9
Industrial	56.2		145.5
Oilfield	39.5		110.9
Public authorities and street light	58.7		151.5
System sales revenues	610.1		1,547.4
Provision for rate refund	13.5		(6.2		)
Integrated market	16.9		38.7
Transmission	33.2		109.2
Other	10.8		21.0
Revenues from contracts with customers	$	684.5	$	1,710.1