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Investment in Unconsolidated Affiliates (Tables)
 9 Months Ended
Sep. 30, 2014
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
Related Party Transactions with Enable
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2014
2013
2014
2013
Operating Revenues:
 
 
 
 
Electricity to power electric compression assets
$
4.1

$
3.9

$
10.1

$
5.2

Cost of Sales:
 
 
 
 
Natural gas transportation services
$
8.8

$
8.7

$
26.2

$
14.5

Natural gas storage services
0.1

3.1

4.5

5.4

Natural gas purchases/(sales) (A)
3.4

9.4

6.9

11.9

(A)
OG&E entered into a new contract with Enable to provide transportation services effective May 1, 2014 which also eliminated the natural gas storage services. In accordance with the cash-out provision of the contract, OG&E purchases gas from Enable when Enable's deliveries exceed OG&E's pipeline receipts. Enable purchases gas from OG&E when OG&E's pipeline receipts exceed Enable's deliveries.