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Summary of Significant Accounting Policies Depreciation and Amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Provision for Depreciation Rate | 3.00% | 2.90%
Projected provision for depreciation in next fiscal year | 3.10% |
Percent Of Intangible Plant Balance Amortizable | 97.00% |
Percent of Intangible Plant Balance Amortizable Thereafter | 3.00% |
Transmission Equipment [Member] | OG&E [Member] |  |
Amount of Acquisition Adjustments | $ 3.3 |
Redbud Plant [Member] |  |
Amount of Acquisition Adjustments | $ 148.3 | $ 148.3

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