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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | $ 6,700,000 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 6,000,000 |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 30,200,000 |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 3,200,000 |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 3,100,000 |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 48,800,000 |  |
Operating Leases, Future Minimum Payments Due | 98,000,000 |  |
Operating Leases, Rent Expense, Net | 8,800,000 | 14,200,000 | 10,400,000
Long-term Purchase Commitment, Amount | 2,824,600,000 |  |
Purchase Obligation, Due in Next Twelve Months | 726,500,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 657,100,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 588,400,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 609,600,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 243,000,000 |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 62,000,000 | 49,500,000 | 36,700,000
Commitments and Contingencies |  |  |
Estimated Environmental Capital Costs | 1,000,000,000 |  |
Potential Penalty Under the Federal Clean Air Act | 37,500 |  |
OG&E Railcar Lease Agreement [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Range of Possible Loss, Maximum | 22,800,000 |  |
OG&E Railcar Lease Agreement [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 3,800,000 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 3,100,000 |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 27,300,000 |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 0 |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 0 |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 0 |  |
Operating Leases, Future Minimum Payments Due | 34,200,000 |  |
OG&E Wind Farm Land Lease Agreements [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 2,100,000 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 2,100,000 |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 2,100,000 |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 2,400,000 |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 2,400,000 |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 48,800,000 |  |
Operating Leases, Future Minimum Payments Due | 59,900,000 |  |
OGE Energy Building Lease [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 800,000 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 800,000 |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 800,000 |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 800,000 |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 700,000 |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 0 |  |
Operating Leases, Future Minimum Payments Due | 3,900,000 |  |
OGE Holdings [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due | 0 |  |
OG&E cogeneration capacity and fixed operation and maintenance payments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 406,300,000 |  |
Purchase Obligation, Due in Next Twelve Months | 85,100,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 82,700,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 81,900,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 79,600,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 77,000,000 |  |
OG&E expected cogeneration energy payments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 366,600,000 |  |
Purchase Obligation, Due in Next Twelve Months | 61,100,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 60,900,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 75,700,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 81,500,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 87,400,000 |  |
OG&E minimum fuel purchase commitments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 1,657,200,000 |  |
Purchase Obligation, Due in Next Twelve Months | 451,800,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 451,800,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 368,500,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 385,100,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0 |  |
Long-term Purchase Commitment, Amount | 657,300,000 | 585,600,000 | 647,600,000
Percentage of OG&E's Projected 2014 Requirements | 31.50% |  |
OG&E expected wind purchase commitments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 297,000,000 |  |
Purchase Obligation, Due in Next Twelve Months | 58,000,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 58,900,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 59,800,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 60,800,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 59,500,000 |  |
OG&E long-term service agreement commitments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 97,500,000 |  |
Purchase Obligation, Due in Next Twelve Months | 70,500,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 2,800,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 2,500,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 2,600,000 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 19,100,000 |  |
Public Utility Regulatory Policy Act of 1978 [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Percentage of output purchased | 100.00% |  |
CPV Keenan [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 30,900,000 | 25,100,000 | 24,500,000
Edison Mission Energy [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 20,600,000 | 20,200,000 | 8,500,000
FPL Energy [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 3,300,000 | 3,400,000 | 3,700,000
NextEra Energy [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 7,200,000 | 800,000 | 0
OG&E total cogeneration payments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 134,800,000 | 135,100,000 | 140,700,000
OG&E capacity payments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 74,400,000 | 77,100,000 | 78,000,000
OG&E long-term service agreement commitments [Member] | McClain Plant [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Factored-Fired Hours | 128,000 |  |
Factored-Fired Starts | 3,600 |  |
OG&E long-term service agreement commitments [Member] | Redbud Plant [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Factored-Fired Hours | 144,000 |  |
Factored-Fired Starts | 4,500 |  |
Additional Factored-Fired Hours | 24,000 |  |
Enogex [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Commitments and Contingencies | 0 |  |
OG&E Wind Energy Purchase Power Lawsuit [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency Accrual | $ 4,300,000 |  |

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