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Commitments and Contingencies - Unrecorded Unconditional Purchase Obligations Disclosure (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Loss Contingencies [Line Items] |
Purchase Obligation, Due in Next Twelve Months | $ 348.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 344.8
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 222.1
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 166.0
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 108.0
Unrecorded Unconditional Purchase Obligation, Total | 1,189.6
OG&E minimum fuel purchase commitments [Member] |
Loss Contingencies [Line Items] |
Purchase Obligation, Due in Next Twelve Months | 118.4
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 100.5
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 69.7
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 56.9
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 46.6
Unrecorded Unconditional Purchase Obligation, Total | 392.1
OG&E Estimated Wind Purchase Commitments [Member] |
Loss Contingencies [Line Items] |
Purchase Obligation, Due in Next Twelve Months | 56.6
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 56.9
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 57.3
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 57.8
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 58.4
Unrecorded Unconditional Purchase Obligation, Total | 287.0
OG&E Capacity Commitments [Member] |
Loss Contingencies [Line Items] |
Purchase Obligation, Due in Next Twelve Months | 32.4
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 33.0
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 40.2
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 41.4
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0.0
Unrecorded Unconditional Purchase Obligation, Total | 147.0
OG&E long-term service agreement commitments [Member] |
Loss Contingencies [Line Items] |
Purchase Obligation, Due in Next Twelve Months | 14.8
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 16.6
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 16.6
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 9.9
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 3.0
Unrecorded Unconditional Purchase Obligation, Total | 60.9
OG&E Generation Capacity Construction Commitments [Member] |
Loss Contingencies [Line Items] |
Purchase Obligation, Due in Next Twelve Months | 126.5
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 137.8
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 38.3
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 0.0
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0.0
Unrecorded Unconditional Purchase Obligation, Total | $ 302.6

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