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v3.8.0.1

Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | $ 4.8 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 23.4 |  |
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 | 40.6 |  |
Operating Leases, Future Minimum Payments Due | 77.5 |  |
Operating Leases, Rent Expense, Net | 6.2 | $ 9.3 | $ 7.7
Purchase Obligation, Due in Next Twelve Months | 402.8 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 244.4 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 173.2 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 170.9 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 168.5 |  |
Long-term Purchase Commitment, Amount | 1,159.8 |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 61.1 | 61.0 | 56.6
OG&E Railcar Lease Agreement [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 1.7 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 20.9 |  |
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 | 22.6 |  |
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 | 2.5 |  |
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 | 40.6 |  |
Operating Leases, Future Minimum Payments Due | 54.3 |  |
OGE Energy Building Lease [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 0.6 |  |
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 | 0.6 |  |
OG&E cogeneration capacity and fixed operation and maintenance payments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase Obligation, Due in Next Twelve Months | 72.8 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 65.3 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 53.2 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 49.5 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 45.4 |  |
Long-term Purchase Commitment, Amount | 286.2 |  |
OG&E expected cogeneration energy payments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase Obligation, Due in Next Twelve Months | 35.7 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 35.6 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 35.9 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 37.1 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 38.3 |  |
Long-term Purchase Commitment, Amount | 182.6 |  |
OG&E minimum fuel purchase commitments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase Obligation, Due in Next Twelve Months | 139.8 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 36.2 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 24.6 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 24.6 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 24.6 |  |
Long-term Purchase Commitment, Amount | 249.8 |  |
OG&E expected wind purchase commitments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase Obligation, Due in Next Twelve Months | 58.7 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 56.5 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 56.9 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 57.3 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 57.8 |  |
Long-term Purchase Commitment, Amount | 287.2 |  |
OG&E long-term service agreement commitments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase Obligation, Due in Next Twelve Months | 7.9 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 41.9 |  |
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 | 2.4 |  |
Long-term Purchase Commitment, Amount | 57.0 |  |
Mustang Modernization [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase Obligation, Due in Next Twelve Months | 24.9 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 0.0 |  |
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 | 24.9 |  |
Environmental compliance plan expenditures [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase Obligation, Due in Next Twelve Months | 63.0 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 8.9 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 0.2 |  |
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 | $ 72.1 |  |
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 | $ 115.2 | 124.8 | 124.0
OG&E capacity payments [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Long-term Purchase Commitment, Amount | 63.0 | 66.3 | 69.5
CPV Keenan [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 29.0 | 29.2 | 26.7
Edison Mission Energy [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 22.1 | 21.1 | 19.7
FPL Energy [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | 2.6 | 3.4 | 3.2
NextEra Energy [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | $ 7.4 | $ 7.3 | $ 7.0
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 | $ 18.2 |  |

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