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Income Taxes | 12 Months Ended
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Dec. 31, 2015
Income Taxes [Abstract] |
Income Tax Disclosure [Text Block] | Income Taxes The items comprising income tax expense are as follows:
Year ended December 31 (In millions) | 2015 | 2014 | 2013
Provision (Benefit) for Current Income Taxes |  |  |
Federal | $ | — |  | $ | — |  | $ | — |
State | (5.2 | ) | (4.5 | ) | 4.3 |
Total Provision (Benefit) for Current Income Taxes | (5.2 | ) | (4.5 | ) | 4.3 |
Provision for Deferred Income Taxes, net |  |  |
Federal | 98.8 |  | 160.0 |  | 154.4 |
State | 4.5 |  | 18.2 |  | (26.4 | )
Total Provision for Deferred Income Taxes, net | 103.3 |  | 178.2 |  | 128.0 |
Deferred Federal Investment Tax Credits, net | (0.7 | ) | (0.9 | ) | (2.0 | )
Total Income Tax Expense | $ | 97.4 |  | $ | 172.8 |  | $ | 130.3 |
The Company file s consolidated income tax returns in the U.S. Federal jurisdiction and various state jurisdictions. With few exceptions, the Company is no longer subject to U.S. Federal tax examinations by tax authorities for years prior to 2012 or state and local tax examinations by tax authorities for years prior to 2011. Income taxes are generally allocated to each company in the affiliated group based on its stand-alone taxable income or loss. Federal investment tax credits previously claimed on electric utility property have been deferred and are being amortized to income over the life of the related property. OG&E earns both Federal and Oklahoma state tax credits associated with production from its wind farms. In addition, OG&E and Enable earn Oklahoma state tax credits associated with their investments in electric generating and natural gas processing facilities which further reduce the Company's effective tax rate. The following schedule reconciles the statutory tax rates to the effective income tax rate:
Year ended December 31 | 2015 | 2014 | 2013
Statutory Federal tax rate | 35.0 | % | 35.0 | % | 35.0 | %
Federal renewable energy credit (A) | (8.9 | ) | (6.7 | ) | (7.2 | )
Remeasurement of state deferred tax liabilities | (0.8 | ) | 0.4 |  | (4.1 | )
401(k) dividends | (0.7 | ) | (0.5 | ) | (0.5 | )
Federal investment tax credits, net | (0.2 | ) | (0.2 | ) | (0.4 | )
Income attributable to noncontrolling interest | — |  | — |  | (0.3 | )
State income taxes, net of Federal income tax benefit | 0.1 |  | 1.2 |  | 0.4 |
Uncertain tax positions | 0.7 |  | 0.5 |  | 1.5 |
Amortization of net unfunded deferred taxes | 0.9 |  | 0.6 |  | 0.6 |
Other | 0.3 |  | 0.1 |  | (0.1 | )
Effective income tax rate | 26.4 | % | 30.4 | % | 24.9 | %
(A) | Represents credits associated with the production from OG&E's wind farms.
The deferred tax provisions are recognized as costs in the ratemaking process by the commissions having jurisdiction over the rates charged by OG&E. As discussed in Note 2, the Company early adopted for the year ended December 31, 2015, ASU 2015-17, Balance Sheet Classification of Deferred Taxes, which requires all deferred tax liabilities and assets, and any related valuation allowance, to be classified as non-current on the balance sheet. The Company's adoption was applied prospectively, and as such, the 2014 presentation of deferred taxes were not retroactively adjusted. The components of Deferred Income Taxes at December 31, 2015 and 2014, respectively, were as follows:
December 31 (In millions) |  | 2014
Current Deferred Income Tax Assets |  |
Net operating losses | $ | 158.4 |
Accrued liabilities | 15.6 |
Federal tax credits | 12.4 |
Accrued vacation | 4.4 |
Uncollectible accounts | 0.6 |
Total Current Deferred Income Tax Assets | $ | 191.4 |
December 31 (In millions) | 2015 | 2014
Non-Current Deferred Income Tax Liabilities, net |  |
Accelerated depreciation and other property related differences | $ | 2,016.0 |  | $ | 1,936.8 |
Investment in Enable Midstream Partners | 623.4 |  | 641.8 |
Company pension plan | 13.7 |  | 34.6 |
Income taxes refundable to customers, net | 22.0 |  | 21.7 |
Regulatory asset | 32.7 |  | 24.7 |
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 | )
Accrued liabilities | (14.0 | ) | — |
Accrued vacation | (3.2 | ) | — |
Deferred Federal investment tax credits | (0.9 | ) | (0.4 | )
Uncollectible accounts | (0.5 | ) | — |
Other | (6.6 | ) | (4.8 | )
Non-Current Deferred Income Tax Liabilities, net | $ | 2,178.2 |  | $ | 2,268.3 |
As of December 31, 2015, the Company has classified $13.2 million of unrecognized tax benefits as a reduction of deferred tax assets recorded. Management is currently unaware of any issues under review that could result in significant additional payments, accruals, or other material deviation from this amount. Following is a reconciliation of the Company’s total gross unrecognized tax benefits as of the years ended December 31, 2015, 2014, and 2013.
(In millions) | 2015 | 2014 | 2013
Balance at January 1 | $ | 10.5 |  | $ | 7.8 |  | $ | — |
Tax positions related to current year: |  |  |
Additions | 2.7 |  | 2.7 |  | 2.7 |
Tax positions related to prior years: |  |  |
Additions | — |  | — |  | 5.1 |
Balance at December 31 | $ | 13.2 |  | $ | 10.5 |  | $ | 7.8 |
Where applicable, the Company classifies income tax-related interest and penalties as interest expense and other expense, respectively. During the year ended December 31, 2015, there were no income tax-related interest or penalties recorded with regard to uncertain tax positions. The total amount of unrecognized tax benefits that would impact the effective tax rate, if recognized, was $13.2 million as of December 31, 2015. In January 2013, OG&E determined that a portion of certain Oklahoma investment tax credits previously recognized but not yet utilized may not be available for utilization in future years. During 2015, OG&E recorded an additional reserve for this item of $4.2 million ($2.7 million after the federal tax benefit) related to the same Oklahoma investment tax credits generated in the current year but not yet utilized due to management's determination that it is more likely than not that it will be unable to utilize these credits. Other The Company sustained Federal and state tax operating losses through 2013 caused primarily by bonus depreciation and other book verses tax temporary differences. As a result, the Company had accrued Federal and state income tax benefits carrying into 2015. As the Company can no longer carry these losses back to prior periods, these losses are being carried forward for utilization in future years. In addition to the operating losses, the Company was unable to utilize the various tax credits that were generated during these years. These tax losses and credits are being carried as deferred tax assets and will be utilized in future periods. Under current law, the Company anticipates future taxable income will be sufficient to utilize all of the losses and credits before they begin to expire, accordingly no valuation allowance is considered necessary. The following table summarizes these carry forwards:
(In millions) | Carry Forward Amount | Deferred Tax Asset | Earliest Expiration Date
Net operating losses |  |  |
State operating loss | $ | 695.5 |  | $ | 25.6 |  | 2030
Federal operating loss | 197.3 |  | 69.0 |  | 2030
Federal tax credits | 184.4 |  | 184.4 |  | 2029
State tax credits |  |  |
Oklahoma investment tax credits | 127.8 |  | 83.0 |  | N/A
Oklahoma capital investment board credits | 7.3 |  | 7.3 |  | N/A
Oklahoma zero emission tax credits | 24.3 |  | 16.4 |  | 2020
The Company has a Federal tax operating loss primarily caused by numerous extensions of accelerated tax bonus depreciation provision which allowed the Company to record current income tax deductions for the cost of certain property placed into service. During 2013, the Company began to utilize these net operating losses. On December 18, 2015, the Protecting Americans from Tax Hikes Act was signed into law. Among other things, the law included an extension of bonus depreciation for 2015, 2016 and 2017 at a rate of 50 percent. The law reduces the bonus depreciation to 40 percent and 30 percent in 2018 and 2019, respectively. The impact of the new law was reflected in the Company's 2015 Consolidated Financial Statements as an increase in Deferred Tax Liabilities with a corresponding increase in Deferred Tax Assets related to the net operating loss. With this extension of bonus depreciation, the Company's utilization of net operating losses will continue into 2016. The Company has generated excess tax benefits of $28.3 million related to its equity based compensation plan which have not been recognized during the time it has been in a net operating loss position. This balance is available to offset future taxable income in addition to the net operating loss balances presented above. The tax benefit and the credit to additional paid-in capital related to these payments will be recorded at a future date when the deduction reduces current taxes payable.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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