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Commitments and Contingencies - Unrecorded Unconditional Purchase Obligations Disclosure (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Loss Contingencies [Line Items]  
Purchase Obligation, Due in Next Twelve Months $ 405.9
Unrecorded Unconditional Purchase Obligation, Due within Two Years 257.3
Unrecorded Unconditional Purchase Obligation, Due within Three Years 191.6
Unrecorded Unconditional Purchase Obligation, Due within Four Years 125.1
Unrecorded Unconditional Purchase Obligation, Due within Five Years 125.5
Unrecorded Unconditional Purchase Obligation, Total 1,105.4
OG&E minimum fuel purchase commitments [Member]  
Loss Contingencies [Line Items]  
Purchase Obligation, Due in Next Twelve Months 138.6
Unrecorded Unconditional Purchase Obligation, Due within Two Years 82.2
Unrecorded Unconditional Purchase Obligation, Due within Three Years 74.7
Unrecorded Unconditional Purchase Obligation, Due within Four Years 63.7
Unrecorded Unconditional Purchase Obligation, Due within Five Years 63.8
Unrecorded Unconditional Purchase Obligation, Total 423.0
OG&E Estimated Wind Purchase Commitments [Member]  
Loss Contingencies [Line Items]  
Purchase Obligation, Due in Next Twelve Months 56.9
Unrecorded Unconditional Purchase Obligation, Due within Two Years 57.3
Unrecorded Unconditional Purchase Obligation, Due within Three Years 57.8
Unrecorded Unconditional Purchase Obligation, Due within Four Years 58.4
Unrecorded Unconditional Purchase Obligation, Due within Five Years 58.6
Unrecorded Unconditional Purchase Obligation, Total 289.0
OG&E Capacity Commitments [Member]  
Loss Contingencies [Line Items]  
Purchase Obligation, Due in Next Twelve Months 33.0
Unrecorded Unconditional Purchase Obligation, Due within Two Years 40.2
Unrecorded Unconditional Purchase Obligation, Due within Three Years 41.4
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 114.6
OG&E long-term service agreement commitments [Member]  
Loss Contingencies [Line Items]  
Purchase Obligation, Due in Next Twelve Months 35.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years 43.8
Unrecorded Unconditional Purchase Obligation, Due within Three Years 17.7
Unrecorded Unconditional Purchase Obligation, Due within Four Years 3.0
Unrecorded Unconditional Purchase Obligation, Due within Five Years 3.1
Unrecorded Unconditional Purchase Obligation, Total 103.3
OG&E Generation Capacity Construction Commitments [Member]  
Loss Contingencies [Line Items]  
Purchase Obligation, Due in Next Twelve Months 141.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years 33.8
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
Unrecorded Unconditional Purchase Obligation, Total $ 175.5