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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Basis Difference [Line Items] |  |  |  |
Amortization of basis difference | [1] | $ 22.1 | $ 28.4 | $ 28.5
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | 652.5 | $ 680.3 |
OGE Energy [Member] |  |  |  |
Reconciliation of Basis Difference [Line Items] |  |  |  |
Amortization of basis difference | [2] | $ 27.8 |  |
[1] | Includes loss on dilution, net of proportional basis difference recognition.
[2] | Includes proportional basis difference recognition due to dilution.

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