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Investment in Unconsolidated Affiliates (Tables)
 9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes related party transactions between OG&E and its affiliate, Enable, during the three and nine months ended September 30, 2015 and 2014.
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2015
2014
2015
2014
Operating Revenues:
 
 
 
 
Electricity to power electric compression assets
$
4.4

$
4.1

$
11.1

$
10.1

Cost of Sales:
 
 
 
 
Natural gas transportation services
$
8.8

$
8.8

$
26.3

$
26.2

Natural gas storage services
—

0.1

—

4.5

Natural gas purchases
2.5

3.4

7.1

6.9