Commitments and Contingencies - Unrecorded Unconditional Purchase Obligations Disclosure (Details) $ in Millions	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	$ 168.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years	163.3
Unrecorded Unconditional Purchase Obligation, Due within Three Years	126.1
Unrecorded Unconditional Purchase Obligation, Due within Four Years	99.0
Unrecorded Unconditional Purchase Obligation, Due within Five Years	106.1
Unrecorded Unconditional Purchase Obligation, Total	663.2
OG&E minimum fuel purchase commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	110.0
Unrecorded Unconditional Purchase Obligation, Due within Two Years	92.2
Unrecorded Unconditional Purchase Obligation, Due within Three Years	66.4
Unrecorded Unconditional Purchase Obligation, Due within Four Years	24.6
Unrecorded Unconditional Purchase Obligation, Due within Five Years	24.6
Unrecorded Unconditional Purchase Obligation, Total	317.8
OG&E expected wind purchase commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	56.0
Unrecorded Unconditional Purchase Obligation, Due within Two Years	56.6
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	57.7
Unrecorded Unconditional Purchase Obligation, Total	284.5
OG&E long-term service agreement commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	2.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years	14.5
Unrecorded Unconditional Purchase Obligation, Due within Three Years	2.8
Unrecorded Unconditional Purchase Obligation, Due within Four Years	17.1
Unrecorded Unconditional Purchase Obligation, Due within Five Years	23.8
Unrecorded Unconditional Purchase Obligation, Total	$ 60.9