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v3.19.3.a.u2

Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | $ 141.1 |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 113.5 |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 109.2 |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 121.0 |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 122.5 |  |
Operating Leases, Future Minimum Payments Due |  | 607.3 |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | 57.7 | $ 57.6 | $ 61.1
OG&E minimum fuel purchase commitments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due |  | 271.4 |  |
Purchase Obligation, Due in Next Twelve Months |  | 82.6 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 55.1 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 50.4 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years |  | 50.4 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 32.9 |  |
OG&E expected wind purchase commitments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due |  | 282.4 |  |
Purchase Obligation, Due in Next Twelve Months |  | 55.7 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 56.0 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 56.4 |  |
Unrecorded Unconditional Purchase Obligation, Due within Four Years |  | 56.8 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 57.5 |  |
OG&E long-term service agreement commitments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due |  | 53.1 |  |
Purchase Obligation, Due in Next Twelve Months |  | 2.4 |  |
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 |  | 13.8 |  |
Unrecorded Unconditional Purchase Obligation, Due within Five Years |  | 32.1 |  |
Environmental compliance plan expenditures [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Future Minimum Payments Due |  | 0.4 |  |
Purchase Obligation, Due in Next Twelve Months |  | 0.4 |  |
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 |  |
OG&E total cogeneration payments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Long-term Purchase Commitment, Amount |  | 14.7 | 112.4 | 115.2
OG&E capacity payments [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Long-term Purchase Commitment, Amount |  | 7.4 | 60.0 | 63.0
CPV Keenan [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | 27.2 | 27.0 | 29.0
Edison Mission Energy [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | 23.1 | 21.7 | 22.1
FPL Energy [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts | [1] | 0.0 | 2.1 | 2.6
NextEra Energy [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Utilities Operating Expense, Purchased Power under Long-term Contracts |  | $ 7.4 | $ 6.8 | $ 7.4
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 |  |
[1] | OG&E's purchased power contract with FPL Energy for 50 MWs expired in 2018.

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