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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 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 three and six months ended June 30, 2017 and 2016.
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
(In millions)
2017
2016
2017
2016
Operating revenues:
 
 
 
 
Electricity to power electric compression assets
$
3.3

$
3.0

$
5.5

$
5.3

Cost of sales:
 
 
 
 
Natural gas transportation services
$
8.8

$
8.8

$
17.5

$
17.5

Natural gas purchases/(sales)
(0.4
)
5.4

(0.8
)
6.9