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Investment in Unconsolidated Affiliates Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Accounts receivable - unconsolidated affiliates	$ 2.4		$ 2.4		$ 5.6
Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Electricity to power electric compression assets	3.6	$ 3.3	6.7	$ 6.0
Operating Costs Charged [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Operating expenses	2.5	3.8	5.3	9.8
Employment Costs [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Operating expenses	8.1	22.2	18.1	53.0
Natural Gas Transportation [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	8.7	8.7	17.5	17.4
Natural Gas Storage [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	0.0	1.1	0.0	4.4
Natural Gas Purchases [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 2.1	$ (1.4)	$ 4.6	$ 3.5