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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Unrecognized Tax Benefits | $ 7.8 |  | $ 0 |  | $ 0 |  | $ 0
Current Federal Tax Expense (Benefit) | 0 |  | (9.1) |  | (5.4) |  |
Current State and Local Tax Expense (Benefit) | 4.3 |  | 0.5 |  | 0.1 |  |
Current Income Tax Expense (Benefit) | 4.3 |  | (8.6) |  | (5.3) |  |
Deferred Federal Income Tax Expense (Benefit) | 154.4 |  | 147.3 |  | 165.5 |  |
Deferred State and Local Income Tax Expense (Benefit) | (26.4) |  | (1.5) |  | 3.8 |  |
Deferred Income Tax Expense (Benefit) | 128.0 |  | 145.8 |  | 169.3 |  |
Investment Tax Credit | (2.0) |  | (2.1) |  | (3.3) |  |
Income Tax Expense (Benefit) | 130.3 |  | 135.1 |  | 160.7 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 35.00% |  | 35.00% |  | 35.00% |  |
Effective Income Tax Rate Reconciliation Amortization of Net Unfunded Deferred Taxes | 0.60% |  | 0.80% |  | 0.70% |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes | 0.40% |  | (0.10%) |  | 0.60% |  |
Effective Income Tax Rate Reconciliation, Tax Credits, Investment | (0.40%) |  | (0.40%) |  | (0.70%) |  |
Effective Income Tax Rate Reconciliation, Deductions, Employee Stock Ownership Plan Dividends | (0.50%) |  | (0.50%) |  | (0.50%) |  |
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Expense) | (0.30%) |  | (1.60%) |  | (1.30%) |  |
Effective Income Tax Rate Reconciliation, Tax Credits, Other | (7.20%) | [1] | (7.20%) | [1] | (3.40%) | [1] |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1.50% |  | 0.00% |  | 0.00% |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | (4.10%) |  | 0.00% |  | 0.00% |  |
Effective Income Tax Rate Reconciliation, Other Adjustments | (0.10%) |  | 0.00% |  | 0.30% |  |
Effective Income Tax Rate, Continuing Operations | 24.90% |  | 26.00% |  | 30.70% |  |
Deferred Tax Assets, Operating Loss Carryforwards | 180.1 |  | 152.4 |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 22.3 |  | 27.1 |  |  |  |
Current Deferred Tax Assets, Federal Tax Credits | 8.0 |  | 6.0 |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 4.7 |  | 3.8 |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 0.7 |  | 1.0 |  |  |  |
Deferred Tax Assets, Gross, Current | 215.8 |  | 190.3 |  |  |  |
Derivative Liabilities, Current | 0 |  | (2.6) |  |  |  |
Deferred Tax Liabilities, Net, Current | 0 |  | (2.6) |  |  |  |
Deferred Tax Assets, Net, Current | 215.8 |  | 187.7 |  |  |  |
Deferred Tax Liabilities, Property, Plant and Equipment | 1,753.3 |  | 1,660.3 |  |  |  |
Non-Current Deferred Tax Liabilities, Investment in Enogex Holdings | 0 |  | 638.0 |  |  |  |
Non-Current Deferred Tax Liabilities, Investment in Enable Midstream Partners | 630.5 |  | 0 |  |  |  |
Deferred Tax Liabilities, Prepaid Expenses | 55.1 |  | 52.4 |  |  |  |
Deferred Tax Liabilities, Income Taxes Refundable to Customers, Net | 21.9 |  | 21.2 |  |  |  |
Deferred Tax Liabilities, Regulatory Assets | 26.1 |  | 18.8 |  |  |  |
Deferred Tax Liabilities, Unamortized Bond Redemption Costs | 3.6 |  | 4.0 |  |  |  |
Deferred Tax Liabilities, Derivatives | 1.6 |  | 1.5 |  |  |  |
Deferred Tax Liabilities, Gross, Noncurrent | 2,492.1 |  | 2,396.2 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards | (105.2) |  | (69.6) |  |  |  |
Non-Current Deferred Tax Assets, State Tax Credits | (92.6) |  | (83.7) |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | (62.8) |  | (57.6) |  |  |  |
Non-Current Deferred Tax Assets, Regulatory Liabilities | (61.3) |  | (71.4) |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations | (20.8) |  | 0 |  |  |  |
Non-Current Deferred Tax Asset, Net Operating Losses | (18.8) |  | (159.1) |  |  |  |
Deferred Tax Assets, Other | (4.6) |  | (4.5) |  |  |  |
Non-Current Deferred Tax Assets, Deferred Federal Investment Tax Credits | (0.7) |  | (1.5) |  |  |  |
Deferred Tax Assets, Gross, Noncurrent | (366.8) |  | (447.4) |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent | 2,125.3 |  | 1,948.8 |  |  |  |
Unrecognized Tax Benefits | 7.8 |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 2.7 |  | 0 |  | 0 |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 5.1 |  | 0 |  | 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 |  |  |  |  |  |
Reduction in income tax expense related to the Midstream Partnership | 8.4 |  |  |  |  |  |
Increase in income tax expense related to deconsolidation | 3.9 |  |  |  |  |  |
State operating loss [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 893.6 |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 32.8 |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2030 |  |  |  |  |  |
Federal operating loss [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 474.6 |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 166.1 |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2030 |  |  |  |  |  |
Federal tax credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 113.2 |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 113.2 |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2029 |  |  |  |  |  |
Oklahoma investment tax credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 106.1 |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 69.0 |  |  |  |  |  |
Oklahoma capital investment board credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 7.3 |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 7.3 |  |  |  |  |  |
Oklahoma zero emission tax credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 24.3 |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 16.3 |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2020 |  |  |  |  |  |
Additional FIN 48 Reserve [Member] |  |  |  |  |  |  |
Income Tax Reconciliation, Tax Contingencies, State and Local | 4.1 |  |  |  |  |  |
Additional FIN 48 reserve, net of tax [Member] |  |  |  |  |  |  |
Income Tax Reconciliation, Tax Contingencies, State and Local | 2.7 |  |  |  |  |  |
FIN 48 reserve, gross [Member] |  |  |  |  |  |  |
Income Tax Reconciliation, Tax Contingencies, State and Local | 7.8 |  |  |  |  |  |
FIN 48 reserve, net of tax [Member] |  |  |  |  |  |  |
Income Tax Reconciliation, Tax Contingencies, State and Local | 5.1 |  |  |  |  |  |
Federal operating loss [Member] |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 180.1 |  |  |  |  |  |
Enable Midstream Partners [Member] |  |  |  |  |  |  |
Deferred Income Tax Expense (Benefit) | $ 16.4 |  |  |  |  |  |
[1] | Represents credits associated with the production from OG&E's wind farms.

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- Definition The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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