Investment in Unconsolidated Affiliates (Tables)

3 Months Ended

Mar. 31, 2014

Related Party Transactions [Abstract]

Schedule of Related Party Transactions [Table Text Block]

Related Party Transactions with Enable

	Three Months Ended
	March 31,
(In millions)	2014
Operating Revenues:
Electricity to power electric compression assets	$	2.9
Cost of Sales:
Natural gas transportation services	$	8.7
Natural gas storage services	3.3
Natural gas purchases	5.0