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Related-Party Transactions Related-Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and 2015.

 
Three Months Ended March 31,
(In millions)
2016
2015
Operating Revenues:
 
 
Electricity to power electric compression assets
$
2.3

$
3.1

Cost of Sales:
 
 
Natural gas transportation services
$
8.8

$
8.8

Natural gas purchases/(sales)
1.5

2.5