Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2020

Related Party Transaction [Line Items]

Schedule of Related Party Transactions [Table Text Block]

The following table summarizes related party transactions between OG&E and Enable during the three months ended March 31, 2020 and 2019.

	Three Months Ended
	March 31,
(In millions)	2020		2019
Operating revenues:
Electricity to power electric compression assets	$	3.7	$	3.8
Cost of sales:
Natural gas transportation services	$	4.7	$	14.8
Natural gas purchases (sales)	$	0.7	$	(1.0)