Related-Party Transactions Related-Party Transactions (Tables)

9 Months Ended

Sep. 30, 2019

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 years ended December 31, 2019, 2018 and 2017.

	Year Ended December 31,
(In millions)	2019		2018		2017
Operating revenues:
Electricity to power electric compression assets	$	15.9	$	16.3	$	14.0
Cost of sales:
Natural gas transportation services	$	41.2	$	37.9	$	35.0
Natural gas (sales) purchases	$	(6.0)	$	(3.2)	$	(2.1)