Investment in Unconsolidated Affiliates (Tables)

6 Months Ended

Jun. 30, 2014

Related Party Transactions [Abstract]

Schedule of Related Party Transactions [Table Text Block]

Related Party Transactions with Enable

	Three Months Ended					Six Months Ended
	June 30,			June 30,		June 30,		June 30,
(In millions)	2014			2013		2014		2013
Operating Revenues:
Electricity to power electric compression assets	$	3.3		$	1.3	$	6.0	$	1.3
Cost of Sales:
Natural gas transportation services	$	8.7		$	5.8	$	17.4	$	5.8
Natural gas storage services	1.1			2.3		4.4		2.3
Natural gas purchases/(sales) (A)	(1.4		)	2.5		3.5		2.5

(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.