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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current Federal Tax Expense (Benefit) |  | $ 0.0 | $ 0.0 | $ 0.0 |
Current State and Local Tax Expense (Benefit) |  | (5.2) | (4.5) | 4.3 |
Current Income Tax Expense (Benefit) |  | (5.2) | (4.5) | 4.3 |
Deferred Federal Income Tax Expense (Benefit) |  | 98.8 | 160.0 | 154.4 |
Deferred State and Local Income Tax Expense (Benefit) |  | 4.5 | 18.2 | (26.4) |
Deferred Income Tax Expense (Benefit) |  | 103.3 | 178.2 | 128.0 |
Investment Tax Credit |  | (0.7) | (0.9) | (2.0) |
Income Tax Expense (Benefit) |  | $ 97.4 | $ 172.8 | $ 130.3 |
Statutory Federal tax rate |  | 35.00% | 35.00% | 35.00% |
Amortization of net unfunded deferred taxes |  | 0.90% | 0.60% | 0.60% |
State income taxes, net of Federal income tax benefit |  | 0.10% | 1.20% | 0.40% |
Federal investment tax credits, net |  | (0.20%) | (0.20%) | (0.40%) |
401(k) dividends |  | (0.70%) | (0.50%) | (0.50%) |
Income attributable to noncontrolling interest |  | 0.00% | 0.00% | (0.30%) |
Federal renewable energy credit | [1] | (8.90%) | (6.70%) | (7.20%) |
Uncertain tax positions |  | 0.70% | 0.50% | 1.50% |
Remeasurement of state deferred tax liabilities |  | (0.80%) | 0.40% | (4.10%) |
Other |  | 0.30% | 0.10% | (0.10%) |
Effective income tax rate |  | 26.40% | 30.40% | 24.90% |
Net operating losses |  |  | $ 158.4 |  |
Accrued liabilities |  | $ (14.0) | (15.6) |  |
Federal tax credits |  |  | 12.4 |  |
Accrued vacation |  | (3.2) | (4.4) |  |
Uncollectible accounts |  | (0.5) | (0.6) |  |
Total Current Deferred Income Tax Assets |  |  | 191.4 |  |
Accelerated depreciation and other property related differences |  | 2,016.0 | 1,936.8 |  |
Investment in Enable Midstream Partners |  | 623.4 | 641.8 |  |
Regulatory asset |  | 32.7 | 24.7 |  |
Income taxes refundable to customers, net |  | 22.0 | 21.7 |  |
Company pension plan |  | 13.7 | 34.6 |  |
Bond redemption-unamortized costs |  | 4.8 | 5.3 |  |
Derivative instruments |  | 1.5 | 1.8 |  |
Federal tax credits |  | (184.4) | (139.0) |  |
State tax credits |  | (106.7) | (98.6) |  |
Net operating losses |  | (94.6) | (19.8) |  |
Postretirement medical and life insurance benefits |  | (56.2) | (56.4) |  |
Regulatory liabilities |  | (46.3) | (58.0) |  |
Asset retirement obligations |  | (22.5) | (21.4) |  |
Deferred Federal investment tax credits |  | (0.9) | (0.4) |  |
Other |  | (6.6) | (4.8) |  |
Non-Current Deferred Income Tax Liabilities, net |  | 2,178.2 | 2,268.3 |  |
Unrecognized Tax Benefits |  | 13.2 |  |  |
Unrecognized Tax Benefits |  | 13.2 | 10.5 | $ 7.8 | $ 0.0
Current year additions |  | 2.7 | 2.7 | 2.7 |
Prior year additions |  | 0.0 | 0.0 | $ 5.1 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 0.0 |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  | 4.2 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 184.4 | $ 139.0 |  |
Employee Service Share-based Compensation, Unrecognized Tax Benefit from Compensation Expense |  | 28.3 |  |  |
State operating loss [Member] |  |  |  |  |
Operating Loss Carryforwards |  | 695.5 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | $ 25.6 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2030 |  |  |
Federal operating loss [Member] |  |  |  |  |
Operating Loss Carryforwards |  | $ 197.3 |  |  |
Net operating losses |  | $ 69.0 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2030 |  |  |
Federal tax credits [Member] |  |  |  |  |
Federal tax credits |  | $ (184.4) |  |  |
Tax Credit Carryforward, Amount |  | 184.4 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 184.4 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2029 |  |  |
Oklahoma investment tax credits [Member] |  |  |  |  |
Federal tax credits |  | $ (83.0) |  |  |
Tax Credit Carryforward, Amount |  | 127.8 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 83.0 |  |  |
Oklahoma capital investment board credits [Member] |  |  |  |  |
Federal tax credits |  | (7.3) |  |  |
Tax Credit Carryforward, Amount |  | 7.3 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 7.3 |  |  |
Oklahoma zero emission tax credits [Member] |  |  |  |  |
Federal tax credits |  | (16.4) |  |  |
Tax Credit Carryforward, Amount |  | 24.3 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 16.4 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2020 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  | $ 2.7 |  |  |
[1] | Represents credits associated with the production from OG&E's wind farms.

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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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