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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 01, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | $ 22.1 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 3.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 3.5 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  | 37.6 |  |  |
Operating Leases, Future Minimum Payments Due |  | 72.9 |  |  |
Operating Leases, Rent Expense, Net |  | 4.9 | $ 6.2 | $ 9.3 |
Purchase Obligation, Due in Next Twelve Months |  | 198.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 104.1 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 104.1 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years |  | 104.5 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 117.0 |  |  |
Long-term Purchase Commitment, Amount |  | 627.7 |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | 57.6 | 61.1 | 61.0 |
OG&E Railcar Lease Agreement [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 18.6 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments Due |  | 18.6 |  |  |
OG&E Wind Farm Land Lease Agreements [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 2.5 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  | 37.6 |  |  |
Operating Leases, Future Minimum Payments Due |  | 51.7 |  |  |
OGE Energy Building Lease [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 1.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 1.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 0.6 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments Due |  | 2.6 |  |  |
OG&E cogeneration capacity and fixed operation and maintenance payments [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase Obligation, Due in Next Twelve Months | [1] | 10.9 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | [1] | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | [1] | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | [1] | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | [1] | 0.0 |  |  |
Long-term Purchase Commitment, Amount | [1] | 10.9 |  |  |
OG&E expected cogeneration energy payments [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase Obligation, Due in Next Twelve Months | [1] | 2.4 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | [1] | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | [1] | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | [1] | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | [1] | 0.0 |  |  |
Long-term Purchase Commitment, Amount | [1] | 2.4 |  |  |
OG&E minimum fuel purchase commitments [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase Obligation, Due in Next Twelve Months |  | 75.8 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 44.6 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 44.6 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years |  | 44.6 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 44.6 |  |  |
Long-term Purchase Commitment, Amount |  | 254.2 |  |  |
OG&E expected wind purchase commitments [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase Obligation, Due in Next Twelve Months |  | 56.3 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 56.9 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 57.1 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years |  | 57.5 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 58.0 |  |  |
Long-term Purchase Commitment, Amount |  | 285.8 |  |  |
OG&E long-term service agreement commitments [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase Obligation, Due in Next Twelve Months |  | 46.8 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 2.4 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 2.4 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years |  | 2.4 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 14.4 |  |  |
Long-term Purchase Commitment, Amount |  | 68.4 |  |  |
Environmental compliance plan expenditures [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase Obligation, Due in Next Twelve Months |  | 5.8 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 0.2 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years |  | 0.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 0.0 |  |  |
Long-term Purchase Commitment, Amount |  | $ 6.0 |  |  |
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 |  | $ 112.4 | 115.2 | 124.8 |
OG&E capacity payments [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Long-term Purchase Commitment, Amount |  | 60.0 | 63.0 | 66.3 |
CPV Keenan [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | 27.0 | 29.0 | 29.2 |
Edison Mission Energy [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | 21.7 | 22.1 | 21.1 |
FPL Energy [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | [2] | 2.1 | 2.6 | 3.4 |
NextEra Energy [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | $ 6.8 | $ 7.4 | $ 7.3 |
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 |  |  |
Maximum [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  | $ 16.2 |  |  | $ 6.8
[1] | Cogeneration capacity, fixed operation and maintenance and energy payments will end in 2019, as a result of contract expiration. As described below, OG&E intends to acquire the AES and Oklahoma Cogeneration LLC power plants, pending regulatory approval.
[2] | OG&E's purchased power contract with FPL Energy for 50 MWs expired in 2018.

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