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Commitments and Contingencies (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jun. 15, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | $ 7,400,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 6,800,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 5,600,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 25,500,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 2,900,000 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 46,300,000 |  |  |
Operating Leases, Future Minimum Payments Due | 94,500,000 |  |  |
Operating Leases, Rent Expense, Net | 7,700,000 | $ 6,700,000 | $ 8,800,000 |
Purchase Obligation, Due in Next Twelve Months | 752,700,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 441,400,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 338,600,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 198,600,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 169,300,000 |  |  |
Long-term Purchase Commitment, Amount | 1,900,600,000 |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 56,600,000 | 60,800,000 | 62,000,000 |
Contract Amount |  |  |  | $ 170,300,000
OG&E Railcar Lease Agreement [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum | 20,100,000 |  |  |
OG&E Railcar Lease Agreement [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 4,200,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 3,500,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 2,400,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 23,000,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 0 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 0 |  |  |
Operating Leases, Future Minimum Payments Due | 33,100,000 |  |  |
OG&E Wind Farm Land Lease Agreements [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 2,400,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 2,500,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 2,500,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 2,500,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 2,900,000 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 46,300,000 |  |  |
Operating Leases, Future Minimum Payments Due | 59,100,000 |  |  |
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 | 700,000 |  |  |
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 | 2,300,000 |  |  |
OG&E cogeneration capacity and fixed operation and maintenance payments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase Obligation, Due in Next Twelve Months | 79,800,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 77,000,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 74,000,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 66,600,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 54,700,000 |  |  |
Long-term Purchase Commitment, Amount | 352,100,000 |  |  |
OG&E expected cogeneration energy payments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase Obligation, Due in Next Twelve Months | 58,300,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 42,700,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 55,200,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 57,600,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 55,100,000 |  |  |
Long-term Purchase Commitment, Amount | 268,900,000 |  |  |
OG&E minimum fuel purchase commitments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase Obligation, Due in Next Twelve Months | 299,600,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 127,500,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 40,700,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 11,700,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0 |  |  |
Long-term Purchase Commitment, Amount | 479,500,000 |  |  |
OG&E expected wind purchase commitments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase Obligation, Due in Next Twelve Months | 58,600,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 58,800,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 57,000,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 55,800,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 56,600,000 |  |  |
Long-term Purchase Commitment, Amount | 286,800,000 |  |  |
OG&E long-term service agreement commitments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase Obligation, Due in Next Twelve Months | 2,500,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 2,600,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 43,200,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 2,800,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 2,900,000 |  |  |
Long-term Purchase Commitment, Amount | 54,000,000 |  |  |
Mustang Modernization expenditures [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase Obligation, Due in Next Twelve Months | 103,400,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 12,900,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 17,700,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0 |  |  |
Long-term Purchase Commitment, Amount | 134,000,000 |  |  |
Environmental compliance plan expenditures [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase Obligation, Due in Next Twelve Months | 150,500,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 119,900,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 50,800,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 4,100,000 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0 |  |  |
Long-term Purchase Commitment, Amount | $ 325,300,000 |  |  |
Public Utility Regulatory Policy Act of 1978 [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Percentage of output purchased | 100.00% |  |  |
OG&E total cogeneration payments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Long-term Purchase Commitment, Amount | $ 124,000,000 | 129,400,000 | 134,800,000 |
OG&E capacity payments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Long-term Purchase Commitment, Amount | 69,500,000 | 72,300,000 | 74,400,000 |
CPV Keenan [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 26,700,000 | 28,100,000 | 30,900,000 |
Edison Mission Energy [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 19,700,000 | 21,300,000 | 20,600,000 |
FPL Energy [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 3,200,000 | 3,600,000 | 3,300,000 |
NextEra Energy [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | $ 7,000,000 | $ 7,800,000 | $ 7,200,000 |
OG&E long-term service agreement commitments [Member] | McClain Plant [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Factored-Fired Hours | 128,000 |  |  |
Factored-Fired Starts | 4,800 |  |  |
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 |  |  |
New Source Review [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated Environmental Capital Costs | $ 1,100,000,000 |  |  |
Potential Penalty Under the Federal Clean Air Act | $ 37,500 |  |  |
Clean Power Plan [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Proposed Rate-Based Carbon Reduction | 43.00% |  |  |
Final Rate-Based Carbon Reduction | 32.00% |  |  |
Mass-Based Carbon Reduction | 24.00% |  |  |

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