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Investment in Unconsolidated Affiliates (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	May 01, 2013
Expected Settlement Charge	$ 14.3
Limited Partner Units Owned	111.0
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.31800
Equity in earnings of unconsolidated affiliates	$ 33.9	$ 35.6
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	706.2		$ 714.2
Enogex LLC [Member]
Percentage of Enogex LLC Contributed				100.00%
Increase in fair value of net assets				$ 2,200.0
Enable Midstream Partners [Member]
Distributions from unconsolidated affiliates	$ 35.3	$ 35.3
OGE Holdings [Member]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest	25.60%	25.70%

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