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Investment in Unconsolidated Affiliate and Related Party Transactions Reconciliation of Basis Difference (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Basis Difference [Line Items] |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 714.2 | $ 743.7 |
Elimination of Enable fair value step up | 17.2 | $ 16.9 | $ 18.0
OGE Energy [Member] |  |  |
Reconciliation of Basis Difference [Line Items] |  |  |
Goodwill, Impairment Loss | $ 1.0 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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