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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2019 and 2018.
 
Three Months Ended
 
March 31,
(In millions)
2019
2018
Operating revenues:
 
 
Electricity to power electric compression assets
$
3.8

$
4.0

Cost of sales:
 
 
Natural gas transportation services
$
14.8

$
8.8

Natural gas (sales) purchases
$
(1.0
)
$
0.3