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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Taxes [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The items comprising income tax expense are as follows:
Year ended December 31 (In millions) | 2016 | 2015 | 2014
Provision (Benefit) for Current Income Taxes |  |  |
Federal | $ | — |  | $ | — |  | $ | — |
State | (5.7 | ) | (5.2 | ) | (4.5 | )
Total Provision (Benefit) for Current Income Taxes | (5.7 | ) | (5.2 | ) | (4.5 | )
Provision for Deferred Income Taxes, net |  |  |
Federal | 126.0 |  | 98.8 |  | 160.0 |
State | 28.0 |  | 4.5 |  | 18.2 |
Total Provision for Deferred Income Taxes, net | 154.0 |  | 103.3 |  | 178.2 |
Deferred Federal Investment Tax Credits, net | (0.2 | ) | (0.7 | ) | (0.9 | )
Total Income Tax Expense | $ | 148.1 |  | $ | 97.4 |  | $ | 172.8 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The following schedule reconciles the statutory tax rates to the effective income tax rate:
Year ended December 31 | 2016 | 2015 | 2014
Statutory Federal tax rate | 35.0 | % | 35.0 | % | 35.0 | %
Federal renewable energy credit (A) | (6.8 | ) | (8.9 | ) | (6.7 | )
Remeasurement of state deferred tax liabilities | 0.9 |  | (0.8 | ) | 0.4 |
401(k) dividends | (0.6 | ) | (0.7 | ) | (0.5 | )
Federal investment tax credits, net | (0.8 | ) | (0.2 | ) | (0.2 | )
State income taxes, net of Federal income tax benefit | 1.9 |  | 0.1 |  | 1.2 |
Uncertain tax positions | 0.1 |  | 0.7 |  | 0.5 |
Amortization of net unfunded deferred taxes | 0.7 |  | 0.9 |  | 0.6 |
Other | 0.1 |  | 0.3 |  | 0.1 |
Effective income tax rate | 30.5 | % | 26.4 | % | 30.4 | %
(A) | Represents credits associated with the production from OG&E's wind farms.
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The components of Deferred Income Taxes at December 31, 2016 and 2015, respectively, were as follows:
December 31 (In millions) | 2016 | 2015
Non-Current Deferred Income Tax Liabilities, net |  |
Accelerated depreciation and other property related differences | $ | 2,103.2 |  | $ | 2,016.0 |
Investment in Enable Midstream Partners | 657.3 |  | 623.4 |
Regulatory asset | 34.4 |  | 32.7 |
Income taxes refundable to customers, net | 24.1 |  | 22.0 |
Company Pension Plan | 16.5 |  | 13.7 |
Bond redemption-unamortized costs | 4.3 |  | 4.8 |
Derivative instruments | 2.2 |  | 1.5 |
Federal tax credits | (220.6 | ) | (184.4 | )
State tax credits | (112.2 | ) | (106.7 | )
Postretirement medical and life insurance benefits | (48.9 | ) | (56.2 | )
Regulatory liabilities | (34.6 | ) | (46.3 | )
Net operating losses | (31.7 | ) | (94.6 | )
Asset retirement obligations | (24.5 | ) | (22.5 | )
Accrued liabilities | (16.1 | ) | (14.0 | )
Other | (14.0 | ) | (6.6 | )
Accrued vacation | (3.5 | ) | (3.2 | )
Deferred Federal investment tax credits | (0.8 | ) | (0.9 | )
Uncollectible accounts | (0.6 | ) | (0.5 | )
Non-Current Deferred Income Tax Liabilities, net | $ | 2,334.5 |  | $ | 2,178.2 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | Following is a reconciliation of the Company’s total gross unrecognized tax benefits as of the years ended December 31, 2016, 2015, and 2014.
(In millions) | 2016 | 2015 | 2014
Balance at January 1 | $ | 20.2 |  | $ | 16.1 |  | $ | 12.0 |
Tax positions related to current year: |  |  |
Additions | 0.5 |  | 4.1 |  | 4.1 |
Balance at December 31 | $ | 20.7 |  | $ | 20.2 |  | $ | 16.1 |
Summary of Tax Credit Carryforwards [Table Text Block] | The following table summarizes these carry forwards:
(In millions) | Carry Forward Amount | Deferred Tax Asset | Earliest Expiration Date
Net operating losses |  |  |
State operating loss | $ | 554.7 |  | $ | 20.4 |  | 2030
Federal operating loss | 32.2 |  | 11.3 |  | 2030
Federal tax credits | 220.6 |  | 220.6 |  | 2029
State tax credits |  |  |
Oklahoma investment tax credits | 135.7 |  | 88.2 |  | N/A
Oklahoma capital investment board credits | 7.3 |  | 7.3 |  | N/A
Oklahoma zero emission tax credits | 24.1 |  | 16.2 |  | 2020
Louisiana inventory credits | 0.7 |  | 0.5 |  | 2019

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: 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=65882285&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: 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=65882285&loc=d3e32537-109319 + Details
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