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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Regulatory Liability, Noncurrent |  | $ 1,188.9 | $ 1,223.5 |  |
Current Federal Tax Expense (Benefit) |  | 8.4 | (6.4) | $ (1.9) |
Current State and Local Tax Expense (Benefit) |  | 0.5 | 5.1 | (4.4) |
Current Income Tax Expense (Benefit) |  | 8.9 | (1.3) | (6.3) |
Deferred Federal Income Tax Expense (Benefit) |  | (105.2) | 48.5 | 74.7 |
Deferred State and Local Income Tax Expense (Benefit) |  | (31.1) | (17.4) | 3.7 |
Deferred Income Tax Expense (Benefit) |  | (136.3) | 31.1 | 78.4 |
Investment Tax Credit |  | 0.0 | 0.0 | 0.1 |
Income Tax Expense (Benefit) |  | $ (127.4) | $ 29.8 | $ 72.2 |
Statutory federal tax rate |  | 21.00% | 21.00% | 21.00% |
Federal deferred tax revaluation |  | 0.00% | 0.00% | 0.40% |
Federal renewable energy credit (B) | [1] | (5.00%) | (6.00%) | (5.10%) |
Remeasurement of state deferred tax liabilities |  | 0.90% | (0.80%) | (0.40%) |
401(k) dividends |  | (0.40%) | (0.40%) | (0.30%) |
State income taxes, net of federal income tax benefit |  | (1.40%) | (1.20%) | 0.40% |
Effective Income Tax Rate Reconciliation, Executive Compensation Limitation, Percent |  | 0.20% | 0.20% | 0.20% |
Amortization of net unfunded deferred taxes |  | (4.40%) | (4.50%) | (2.10%) |
Other |  | 0.10% | (0.70%) | 0.40% |
Effective income tax rate |  | 42.30% | 6.40% | 14.50% |
Accrued liabilities |  | $ (9.6) | $ (10.7) |  |
Accrued vacation |  | (2.2) | (2.1) |  |
Uncollectible accounts |  | (0.7) | (0.4) |  |
Accelerated depreciation and other property related differences |  | 1,721.2 | 1,656.8 |  |
Investment in Enable |  | 302.6 | 478.2 |  |
Regulatory assets |  | 52.3 | 28.4 |  |
Income taxes recoverable from customers, net |  | (221.8) | (229.9) |  |
Pension Plan |  | 3.9 | 4.1 |  |
Bond redemption-unamortized costs |  | 2.0 | 2.2 |  |
Derivative instruments |  | 1.7 | 1.6 |  |
Federal tax credits |  | (236.6) | (238.0) |  |
State tax credits |  | (204.4) | (185.8) |  |
Postretirement medical and life insurance benefits |  | (22.4) | (23.3) |  |
Net operating losses |  | (12.0) | (16.6) |  |
Regulatory liabilities |  | (81.0) | (68.1) |  |
Asset retirement obligations |  | (20.3) | (19.2) |  |
Deferred federal investment tax credits |  | (2.7) | (1.8) |  |
Other |  | (1.4) | 0.4 |  |
Total deferred income tax liabilities, net |  | 1,268.6 | 1,375.8 |  |
Unrecognized Tax Benefits |  | 21.9 | 20.7 | $ 20.7 | $ 20.7
Current year additions |  | 1.2 | 0.0 | $ 0.0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 0.0 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 236.6 | $ 238.0 |  |
Stock-based compensation |  | (0.30%) | (1.20%) | 0.00% |
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent | [2] | 31.60% | 0.00% | 0.00% |
Deferred Tax Asset [Member] |  |  |  |  |
Unrecognized Tax Benefits |  | $ 17.6 |  |  |
State operating loss [Member] |  |  |  |  |
Operating Loss Carryforwards |  | 268.0 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | 12.0 |  |  |
Federal tax credits [Member] |  |  |  |  |
Federal tax credits |  | (236.6) |  |  |
Tax Credit Carryforward, Amount |  | 236.6 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 236.6 |  |  |
Oklahoma investment tax credits [Member] |  |  |  |  |
State tax credits |  | (162.3) |  |  |
Tax Credit Carryforward, Amount |  | 205.6 |  |  |
Oklahoma capital investment board credits [Member] |  |  |  |  |
State tax credits |  | (12.7) |  |  |
Tax Credit Carryforward, Amount |  | 12.7 |  |  |
Oklahoma zero emission tax credits [Member] |  |  |  |  |
State tax credits |  | (29.3) |  |  |
Tax Credit Carryforward, Amount |  | 37.2 |  |  |
Louisiana inventory credits |  |  |  |  |
State tax credits |  | (0.1) |  |  |
Tax Credit Carryforward, Amount |  | 0.2 |  |  |
Research and Development Credits [Member] |  |  |  |  |
Tax Credit Carryforward, Amount |  | 1.2 |  |  |
Og and E [Member] |  |  |  |  |
Regulatory Liability, Noncurrent |  | 1,188.9 | $ 1,223.5 |  |
Current Federal Tax Expense (Benefit) |  | (3.8) | (7.9) | $ (12.4) |
Current State and Local Tax Expense (Benefit) |  | (0.6) | 4.1 | (4.1) |
Current Income Tax Expense (Benefit) |  | (4.4) | (3.8) | (16.5) |
Deferred Federal Income Tax Expense (Benefit) |  | 45.7 | 37.7 | 53.7 |
Deferred State and Local Income Tax Expense (Benefit) |  | (6.6) | (13.8) | 2.7 |
Deferred Income Tax Expense (Benefit) |  | 39.1 | 23.9 | 56.4 |
Investment Tax Credit |  | 0.0 | 0.0 | 0.1 |
Income Tax Expense (Benefit) |  | $ 34.7 | $ 20.1 | $ 40.0 |
Statutory federal tax rate |  | 21.00% | 21.00% | 21.00% |
Federal deferred tax revaluation |  | 0.00% | 0.00% | 0.00% |
Federal renewable energy credit (B) | [1] | (5.40%) | (7.60%) | (6.90%) |
Remeasurement of state deferred tax liabilities |  | 0.00% | 0.00% | 0.00% |
401(k) dividends |  | 0.00% | 0.00% | 0.00% |
State income taxes, net of federal income tax benefit |  | (1.60%) | (1.80%) | (0.20%) |
Effective Income Tax Rate Reconciliation, Executive Compensation Limitation, Percent |  | 0.00% | 0.00% | 0.00% |
Amortization of net unfunded deferred taxes |  | (4.80%) | (5.60%) | (2.90%) |
Other |  | 0.10% | (0.60%) | (0.10%) |
Effective income tax rate |  | 9.30% | 5.40% | 10.90% |
Accrued liabilities |  | $ (5.2) | $ (4.3) |  |
Accrued vacation |  | (1.6) | (1.6) |  |
Uncollectible accounts |  | (0.7) | (0.4) |  |
Accelerated depreciation and other property related differences |  | 1,721.2 | 1,656.8 |  |
Investment in Enable |  | 0.0 | 0.0 |  |
Regulatory assets |  | 52.3 | 28.4 |  |
Income taxes recoverable from customers, net |  | (221.8) | (229.9) |  |
Pension Plan |  | 27.4 | 24.5 |  |
Bond redemption-unamortized costs |  | 2.0 | 2.2 |  |
Derivative instruments |  | 0.0 | 0.0 |  |
Federal tax credits |  | (236.6) | (238.0) |  |
State tax credits |  | (189.0) | (170.8) |  |
Postretirement medical and life insurance benefits |  | (15.3) | (16.0) |  |
Net operating losses |  | (1.4) | (5.7) |  |
Regulatory liabilities |  | (81.0) | (68.1) |  |
Asset retirement obligations |  | (20.3) | (19.2) |  |
Deferred federal investment tax credits |  | (2.7) | (1.8) |  |
Other |  | (6.5) | (4.7) |  |
Total deferred income tax liabilities, net |  | 1,020.8 | 951.4 |  |
Unrecognized Tax Benefits |  | 17.6 | 16.4 | $ 16.4 |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 236.6 | $ 238.0 |  |
Stock-based compensation |  | 0.00% | 0.00% | 0.00% |
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent | [2] | 0.00% | 0.00% | 0.00% |
Og and E [Member] | State operating loss [Member] |  |  |  |  |
Operating Loss Carryforwards |  | $ 21.5 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | 1.4 |  |  |
Og and E [Member] | Federal tax credits [Member] |  |  |  |  |
Federal tax credits |  | (236.6) |  |  |
Tax Credit Carryforward, Amount |  | 236.6 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 236.6 |  |  |
Og and E [Member] | Oklahoma investment tax credits [Member] |  |  |  |  |
State tax credits |  | (147.0) |  |  |
Tax Credit Carryforward, Amount |  | 186.1 |  |  |
Og and E [Member] | Oklahoma capital investment board credits [Member] |  |  |  |  |
State tax credits |  | (12.7) |  |  |
Tax Credit Carryforward, Amount |  | 12.7 |  |  |
Og and E [Member] | Oklahoma zero emission tax credits [Member] |  |  |  |  |
State tax credits |  | (29.3) |  |  |
Tax Credit Carryforward, Amount |  | 37.2 |  |  |
Og and E [Member] | Louisiana inventory credits |  |  |  |  |
State tax credits |  | 0.0 |  |  |
Tax Credit Carryforward, Amount |  | $ 0.0 |  |  |
[1] | Represents credits primarily associated with the production from OG&E's wind farms.
[2] | As further discussed in Note 5, OGE Energy recorded a $780.0 million impairment on its investment in Enable in March 2020, which resulted in a tax benefit being recorded that caused a significant variance to the effective tax rate as compared to the prior year. This variance has been presented in the table as a single line item in order to facilitate comparability of other components of the effective tax rate.

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