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Investment in Unconsolidated Affiliates (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2015 and 2014.
 
Three Months Ended
 
March 31,
(In millions)
2015
2014
Operating Revenues:
 
 
Electricity to power electric compression assets
$
3.1

$
2.9

Cost of Sales:
 
 
Natural gas transportation services
$
8.8

$
8.7

Natural gas storage services
—

3.3

Natural gas purchases
2.5

5.0