Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
(In millions)	2019			2018
Residential	$	191.2		$	196.3
Commercial	115.1			117.8
Industrial	43.1			41.7
Oilfield	38.9			33.7
Public authorities and street light	40.1			41.7
System sales revenues	428.4			431.2
Provision for rate refund	(0.1		)	(3.2		)
Integrated market	6.7			8.6
Transmission	36.1			35.8
Other	6.3			5.5
Revenues from contracts with customers	$	477.4		$	477.9