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Related-Party Transactions Related-Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015.

Year Ended December 31 (In millions)
2017
2016
2015
Operating revenues:
 
 
 
Electricity to power electric compression assets
$
14.0

$
11.5

$
13.8

Cost of sales:
 
 
 
Natural gas transportation services
$
35.0

$
35.0

$
35.0

Natural gas purchases (sales)
(2.1
)
11.2

7.6