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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Regulatory Liability, Noncurrent |  | $ 1,223.5 | $ 1,270.7 |  |  |
Current Federal Tax Expense (Benefit) |  | (6.4) | (1.9) | $ 4.9 |  |
Current State and Local Tax Expense (Benefit) |  | 5.1 | (4.4) | (4.2) |  |
Current Income Tax Expense (Benefit) |  | (1.3) | (6.3) | 0.7 |  |
Deferred Federal Income Tax Expense (Benefit) |  | 48.5 | 74.7 | (75.9) |  |
Deferred State and Local Income Tax Expense (Benefit) |  | (17.4) | 3.7 | 26.0 |  |
Deferred Income Tax Expense (Benefit) |  | 31.1 | 78.4 | (49.9) |  |
Investment Tax Credit |  | 0.0 | 0.1 | (0.1) |  |
Income Tax Expense (Benefit) |  | $ 29.8 | $ 72.2 | $ (49.3) | [1] |
Statutory federal tax rate |  | 21.00% | 21.00% | 35.00% |  |
Federal deferred tax revaluation |  | 0.00% | 0.40% | (41.20%) |  |
Federal renewable energy credit (A) | [2] | (6.00%) | (5.10%) | (4.80%) |  |
Remeasurement of state deferred tax liabilities |  | (0.80%) | (0.40%) | 0.40% |  |
401(k) dividends |  | (0.40%) | (0.30%) | (0.50%) |  |
Federal investment tax credits, net |  | 0.00% | 0.00% | (0.10%) |  |
State income taxes, net of federal income tax benefit |  | (1.20%) | 0.40% | 2.00% |  |
Effective Income Tax Rate Reconciliation, Executive Compensation Limitation, Percent |  | 0.20% | 0.20% | 0.00% |  |
Amortization of net unfunded deferred taxes |  | (4.50%) | (2.10%) | 0.70% |  |
Other |  | (0.70%) | 0.40% | (0.10%) |  |
Effective income tax rate |  | 6.40% | 14.50% | (8.60%) |  |
Accrued liabilities |  | $ (10.7) | $ (12.5) |  |  |
Accrued vacation |  | (2.1) | (2.3) |  |  |
Uncollectible accounts |  | (0.4) | (0.4) |  |  |
Accelerated depreciation and other property related differences |  | 1,656.8 | 1,605.3 |  |  |
Investment in Enable |  | 478.2 | 469.9 |  |  |
Regulatory assets |  | 28.4 | 17.4 |  |  |
Income taxes recoverable from customers, net |  | (229.9) | (239.6) |  |  |
Company Pension Plan |  | 4.1 | 7.6 |  |  |
Bond redemption-unamortized costs |  | 2.2 | 2.4 |  |  |
Derivative instruments |  | 1.6 | 1.7 |  |  |
Federal tax credits |  | (238.0) | (237.8) |  |  |
State tax credits |  | (185.8) | (156.0) |  |  |
Postretirement medical and life insurance benefits |  | (23.3) | (23.6) |  |  |
Net operating losses |  | (16.6) | (20.2) |  |  |
Regulatory liabilities |  | (68.1) | (78.8) |  |  |
Asset retirement obligations |  | (19.2) | (21.5) |  |  |
Deferred federal investment tax credits |  | (1.8) | (1.8) |  |  |
Other |  | 0.4 | 1.1 |  |  |
Total deferred income tax liabilities, net |  | 1,375.8 | 1,310.9 |  |  |
Unrecognized Tax Benefits |  | 20.7 | 20.7 | $ 20.7 |  | $ 20.7
Current year additions |  | 0.0 | 0.0 | $ 0.0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 0.0 |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 238.0 | $ 237.8 |  |  |
Stock-based compensation |  | (1.20%) | 0.00% | 0.00% |  |
State operating loss [Member] |  |  |  |  |  |
Operating Loss Carryforwards |  | $ 371.6 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | 16.6 |  |  |  |
Federal tax credits [Member] |  |  |  |  |  |
Federal tax credits |  | (238.0) |  |  |  |
Tax Credit Carryforward, Amount |  | 238.0 |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 238.0 |  |  |  |
Oklahoma investment tax credits [Member] |  |  |  |  |  |
State tax credits |  | (145.3) |  |  |  |
Tax Credit Carryforward, Amount |  | 183.9 |  |  |  |
Oklahoma capital investment board credits [Member] |  |  |  |  |  |
State tax credits |  | (12.4) |  |  |  |
Tax Credit Carryforward, Amount |  | 12.4 |  |  |  |
Oklahoma zero emission tax credits [Member] |  |  |  |  |  |
State tax credits |  | (28.0) |  |  |  |
Tax Credit Carryforward, Amount |  | 34.9 |  |  |  |
Louisiana inventory credits |  |  |  |  |  |
State tax credits |  | (0.1) |  |  |  |
Tax Credit Carryforward, Amount |  | 0.2 |  |  |  |
Og and E [Member] |  |  |  |  |  |
Unrecognized Tax Benefits |  | $ 16.4 | $ 16.4 | $ 16.4 |  |
[1] | The Company recorded an income tax benefit of $245.2 million and income tax expense of $10.5 million during the fourth quarter of 2017 due to the Company remeasuring deferred taxes related to the natural gas midstream operations and other operations segments, respectively, as a result of the 2017 Tax Act.
[2] | Represents credits associated with the production from OG&E's wind farms.

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