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Related Party Transactions (Tables)
 3 Months Ended
Mar. 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 three months ended March 31, 2017 and 2016.
 
Three Months Ended
 
March 31,
(In millions)
2017
2016
Operating Revenues:
 
 
Electricity to power electric compression assets
$
2.2

$
2.3

Cost of Sales:
 
 
Natural gas transportation services
$
8.8

$
8.8

Natural gas purchases/(sales)
(0.4
)
1.5