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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]
Net income	$ 104.6	$ 110.8
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	706.2		$ 714.2
Proportionate Unconsolidated Affiliate Net Income	26.8	28.5
Amortization of basis difference	2.8	2.8
Elimination of Enable fair value step up	4.3	4.3
Equity in earnings of unconsolidated affiliates	33.9	$ 35.6
Equity in Earnings Change in Basis Difference	$ (0.9)
OGE Holdings [Member]
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest	25.60%	25.70%

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[Line Items] for Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table]

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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The amount of net income (loss) reported by an equity method investment of the entity.

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