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Investment in Unconsolidated Affiliates Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Accounts receivable - unconsolidated affiliates	$ 5.1		$ 5.1		$ 5.6
Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Electricity to power electric compression assets	4.4	$ 4.1	11.1	$ 10.1
Operating Costs Charged [Member] \| Enable Midstream Partners [Member] \| OGE Energy [Member]
Related Party Transaction [Line Items]
Operating expenses	2.6	3.3	7.9	13.1
Employment Costs [Member] \| Enable Midstream Partners [Member] \| OGE Energy [Member]
Related Party Transaction [Line Items]
Operating expenses	7.0	25.0	25.1	78.0
Natural Gas Transportation [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	8.8	8.8	26.3	26.2
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	0.1	0.0	4.5
Natural Gas Purchases [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 2.5	$ 3.4	$ 7.1	$ 6.9