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v3.8.0.1

Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reduction in net deferred income tax liability |  | $ 1,273.0 |  |  |
Current Federal Tax Expense (Benefit) |  | 4.9 | $ 0.0 | $ 0.0 |
Current State and Local Tax Expense (Benefit) |  | (4.2) | (5.7) | (5.2) |
Current Income Tax Expense (Benefit) |  | 0.7 | (5.7) | (5.2) |
Deferred Federal Income Tax Expense (Benefit) |  | (75.9) | 126.0 | 98.8 |
Deferred State and Local Income Tax Expense (Benefit) |  | 26.0 | 28.0 | 4.5 |
Deferred Income Tax Expense (Benefit) |  | (49.9) | 154.0 | 103.3 |
Investment Tax Credit |  | (0.1) | (0.2) | (0.7) |
Income Tax Expense (Benefit) |  | $ (49.3) | $ 148.1 | $ 97.4 |
Statutory federal tax rate |  | 35.00% | 35.00% | 35.00% |
Federal deferred tax revaluation |  | (41.20%) | 0.00% | 0.00% |
Federal renewable energy credit (A) | [1] | (4.80%) | (6.80%) | (8.90%) |
Remeasurement of state deferred tax liabilities |  | 0.40% | 0.90% | (0.80%) |
401(k) dividends |  | (0.50%) | (0.60%) | (0.70%) |
Federal investment tax credits, net |  | (0.10%) | (0.80%) | (0.20%) |
State income taxes, net of federal income tax benefit |  | 2.00% | 1.90% | 0.10% |
Uncertain tax positions |  | 0.00% | 0.10% | 0.70% |
Amortization of net unfunded deferred taxes |  | 0.70% | 0.70% | 0.90% |
Other |  | (0.10%) | 0.10% | 0.30% |
Effective income tax rate |  | (8.60%) | 30.50% | 26.40% |
Accrued liabilities |  | $ (7.4) | $ (16.1) |  |
Accrued vacation |  | (2.1) | (3.5) |  |
Uncollectible accounts |  | (0.4) | (0.6) |  |
Accelerated depreciation and other property related differences |  | 1,449.6 | 2,103.2 |  |
Investment in Enable Midstream Partners |  | 441.7 | 657.3 |  |
Regulatory asset |  | 18.9 | 34.4 |  |
Income taxes (recoverable from) refundable to customers, net |  | (244.3) | 24.1 |  |
Company Pension Plan |  | 11.5 | 16.5 |  |
Bond redemption-unamortized costs |  | 2.6 | 4.3 |  |
Derivative instruments |  | 1.6 | 2.2 |  |
Federal tax credits |  | (218.5) | (220.6) |  |
State tax credits |  | (141.7) | (112.2) |  |
Postretirement medical and life insurance benefits |  | (25.2) | (48.9) |  |
Net operating losses |  | (21.1) | (31.7) |  |
Regulatory liabilities |  | (16.8) | (34.6) |  |
Asset retirement obligations |  | (19.2) | (24.5) |  |
Deferred federal investment tax credits |  | (0.5) | (0.8) |  |
Other |  | (0.9) | (14.0) |  |
Total deferred income tax liabilities, net |  | 1,227.8 | 2,334.5 |  |
Unrecognized Tax Benefits |  | 20.7 | 20.7 | $ 20.2 | $ 16.1
Current year additions |  | 0.0 | 0.5 | 4.1 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 0.0 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 218.5 | 220.6 |  |
Reduction in income tax expense |  | 234.7 |  |  |
Increased Regulatory Liabilities due to Income Taxes |  | 1,038.0 |  |  |
State operating loss [Member] |  |  |  |  |
Operating Loss Carryforwards |  | 472.1 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | $ 21.1 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2030 |  |  |
Federal tax credits [Member] |  |  |  |  |
Federal tax credits |  | $ (218.5) |  |  |
Tax Credit Carryforward, Amount |  | 218.5 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 218.5 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2029 |  |  |
Oklahoma investment tax credits [Member] |  |  |  |  |
Federal tax credits |  | $ (113.8) |  |  |
Tax Credit Carryforward, Amount |  | 144.1 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 113.8 |  |  |
Oklahoma capital investment board credits [Member] |  |  |  |  |
Federal tax credits |  | (8.5) |  |  |
Tax Credit Carryforward, Amount |  | 8.5 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 8.5 |  |  |
Oklahoma zero emission tax credits [Member] |  |  |  |  |
Federal tax credits |  | (19.4) |  |  |
Tax Credit Carryforward, Amount |  | 24.1 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 19.4 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2020 |  |  |
OGE Energy Corp. [Member] |  |  |  |  |
Unrecognized Tax Benefits |  | $ 16.4 |  |  |
Og and E [Member] |  |  |  |  |
Unrecognized Tax Benefits |  |  | $ 13.5 | $ 13.2 |
[1] | Represents credits associated with the production from OG&E's wind farms.

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