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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2016 and 2015.
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
(In millions)
2016
2015
2016
2015
Operating Revenues:
 
 
 
 
Electricity to power electric compression assets
$
3.0

$
3.6

$
5.3

$
6.7

Cost of Sales:
 
 
 
 
Natural gas transportation services
$
8.8

$
8.7

$
17.5

$
17.5

Natural gas purchases/(sales)
5.4

2.1

6.9

4.6