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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2018
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 nine months ended September 30, 2018 and 2017.
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2018
2017
2018
2017
Operating revenues:
 
 
 
 
Electricity to power electric compression assets
$
4.7

$
4.5

$
12.2

$
10.0

Cost of sales:
 
 
 
 
Natural gas transportation services
$
8.8

$
8.8

$
26.3

$
26.3

Natural gas purchases (sales)
$
0.1

$
0.4

$
2.6

$
(0.4
)