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Retirement Plans and Postretirement Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | $ 5.4 |  | $ 7.6 | $ 11.2 |
Interest cost |  | $ 15.9 |  | $ 15.7 | $ 13.3 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Expected return on plan assets |  | $ (16.2) |  | $ (25.4) | $ (34.1) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of net loss |  | $ 8.0 |  | $ 8.9 | $ 9.4 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of unrecognized prior service cost | [1] | $ 0.0 |  | $ 0.0 | $ 0.0 |
Settlement cost |  | 21.8 |  | 30.6 | 41.3 |
Total net periodic benefit cost (income) |  | 34.9 |  | 37.4 | 41.1 |
Less: Amount paid by unconsolidated affiliates |  | 0.0 |  | 0.0 | (0.2) |
Net periodic benefit cost (income) |  | 34.9 |  | 37.4 | 41.3 |
Pension Plan [Member] | Oklahoma Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost | [2] | 20.1 |  | 15.4 | 37.9 |
Change in pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction | [2] | 33.3 |  | 15.2 | 23.0 |
Pension Plan [Member] | Arkansas Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost |  | 1.9 | [2] | 1.4 | 3.5 | [2]
Pension Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 4.4 |  | 6.2 | 7.7 |
Interest cost |  | $ 12.6 |  | $ 12.1 | $ 9.7 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Expected return on plan assets |  | $ (12.9) |  | $ (19.6) | $ (24.7) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of net loss |  | $ 6.9 |  | $ 7.4 | $ 7.0 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Settlement cost |  | $ 20.4 |  | $ 12.9 | $ 33.1 |
Total net periodic benefit cost (income) |  | 31.4 |  | 19.0 | 32.8 |
Amount Attributable to Parent |  | 3.0 |  | 5.2 | 6.5 |
Net periodic benefit cost (income) |  | 34.4 |  | 24.2 | 39.3 |
Other Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 1.0 |  | 1.1 | 0.8 |
Interest cost |  | $ 0.3 |  | $ 0.2 | $ 0.1 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Expected return on plan assets |  | $ 0.0 |  | $ 0.0 | $ 0.0 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of net loss |  | $ 0.0 |  | $ 0.2 | $ 0.2 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of unrecognized prior service cost | [1] | $ 0.3 |  | $ 0.2 | $ 0.1 |
Settlement cost |  | 0.5 |  | 0.3 | 2.1 |
Total net periodic benefit cost (income) |  | 2.1 |  | 2.0 | 3.3 |
Less: Amount paid by unconsolidated affiliates |  | 0.0 |  | 0.0 | 0.1 |
Net periodic benefit cost (income) |  | 2.1 |  | 2.0 | 3.2 |
Other Pension Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.0 |  | 0.0 | 0.0 |
Interest cost |  | $ 0.0 |  | $ 0.0 | $ 0.0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Expected return on plan assets |  | $ 0.0 |  | $ 0.0 | $ 0.0 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of net loss |  | $ 0.0 |  | $ 0.0 | $ 0.1 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Settlement cost |  | $ 0.4 |  | $ 0.0 | $ 1.6 |
Total net periodic benefit cost (income) |  | 0.4 |  | 0.0 | 1.7 |
Amount Attributable to Parent |  | 1.7 |  | 1.5 | 1.5 |
Net periodic benefit cost (income) |  | 2.1 |  | 1.5 | 3.2 |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.1 |  | 0.2 | 0.2 |
Interest cost |  | $ 5.2 |  | $ 3.5 | $ 3.4 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Expected return on plan assets |  | $ (1.7) |  | $ (1.8) | $ (1.8) |
Amortization of net loss |  | $ (0.2) |  | $ 1.5 | $ 2.8 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of unrecognized prior service cost | [3] | $ 0.0 |  | $ (3.8) | $ (6.9) |
Total net periodic benefit cost (income) |  | 3.4 |  | (0.4) | (2.3) |
Less: Amount paid by unconsolidated affiliates | [4] | 0.0 |  | 0.0 | (0.5) |
Net periodic benefit cost (income) |  | 3.4 |  | (0.4) | (1.8) |
Other Postretirement Benefits Plan [Member] | Oklahoma Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Change in pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction | [5] | 4.4 |  | 0.6 | (0.4) |
Other Postretirement Benefits Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.1 |  | 0.1 | 0.1 |
Interest cost |  | $ 3.9 |  | $ 2.7 | $ 2.6 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Expected return on plan assets |  | $ (1.6) |  | $ (1.6) | $ (1.7) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of net loss |  | $ 0.0 |  | $ 1.5 | $ 2.7 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | Pension and Other Postretirement Benefits Cost (Reversal of Cost) | Pension and Other Postretirement Benefits Cost (Reversal of Cost) |
Amortization of unrecognized prior service cost | [3] | $ 0.0 |  | $ (3.6) | $ (5.0) |
Total net periodic benefit cost (income) |  | 2.4 |  | (0.9) | (1.3) |
Amount Attributable to Parent | [4] | 0.5 |  | 0.0 | (0.5) |
Net periodic benefit cost (income) |  | $ 2.9 |  | $ (0.9) | $ (1.8) |
[1] | Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
[2] | Included in the pension regulatory asset in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
[3] | Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
[4] | "Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.
[5] | Included in the pension regulatory asset, as indicated in the regulatory assets and liabilities table in Note 1.

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