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Related-Party Transactions Related-Party Transactions (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2016, 2015 and 2014.

Year Ended December 31, (In millions)
2016
2015
2014
Operating Revenues:
 
 
 
Electricity to power electric compression assets
$
11.5

$
13.8

$
13.3

Cost of Sales:
 
 
 
Natural gas transportation services
$
35.0

$
35.0

$
34.9

Natural gas storage services
—

—

4.4

Natural gas purchases/(sales)
11.2

7.6

8.7