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Investment in Unconsolidated Affiliate and Related Party Transactions Related Party Transactions (Details) (Og and E [Member], Enogex [Member], USD $) In Millions, unless otherwise specified	8 Months Ended	12 Months Ended	8 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Operating Costs Charged [Member]	Dec. 31, 2013 Natural Gas Transportation [Member]	Dec. 31, 2013 Natural Gas Storage [Member]	Dec. 31, 2013 Natural Gas Purchases [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party		$ 17.8
Revenue from Related Parties	7.7
Related Party Transaction, Purchases from Related Party			$ 23.2	$ 8.6	$ 14.8

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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