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Retirement Plans and Postretirement Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | $ 5.3 |  | $ 5.4 |  | $ 7.6
Interest cost |  | $ 15.6 |  | $ 15.9 |  | $ 15.7
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 |  | $ (16.5) |  | $ (16.2) |  | $ (25.4)
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 (gain) |  | $ 6.5 |  | $ 8.0 |  | $ 8.9
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 |  | 0.0 |  | 21.8 |  | 30.6
Net periodic benefit cost (income) |  | 10.9 |  | 34.9 |  | 37.4
Pension Plan [Member] | Oklahoma Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost | [2] | 0.0 |  | 20.1 |  | 15.4
Change in pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction | [2] | 5.8 |  | 33.3 |  | 15.2
Pension Plan [Member] | Arkansas Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost |  | 0.0 | [2] | 1.9 | [2] | 1.4
Pension Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 5.3 |  | 4.4 |  | 6.2
Interest cost |  | $ 13.4 |  | $ 12.6 |  | $ 12.1
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 |  | $ (14.0) |  | $ (12.9) |  | $ (19.6)
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 (gain) |  | $ 6.2 |  | $ 6.9 |  | $ 7.4
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)
Settlement cost |  | $ 0.0 |  | $ 20.4 |  | $ 12.9
Total net periodic benefit cost (income) |  | 10.9 |  | 31.4 |  | 19.0
Amount Attributable to Parent |  | 0.0 |  | 3.0 |  | 5.2
Net periodic benefit cost (income) |  | 10.9 |  | 34.4 |  | 24.2
Other Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 1.0 |  | 1.0 |  | 1.1
Interest cost |  | $ 0.3 |  | $ 0.3 |  | $ 0.2
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 (gain) |  | $ 0.0 |  | $ 0.0 |  | $ 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 |  | $ 0.3 |  | $ 0.2
Settlement cost |  | 0.0 |  | 0.5 |  | 0.3
Net periodic benefit cost (income) |  | 1.6 |  | 2.1 |  | 2.0
Other Pension Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.1 |  | 0.0 |  | 0.0
Interest cost |  | $ 0.1 |  | $ 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 (gain) |  | $ 0.0 |  | $ 0.0 |  | $ 0.0
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 |  | $ 0.0 |  | $ 0.4 |  | $ 0.0
Total net periodic benefit cost (income) |  | 0.2 |  | 0.4 |  | 0.0
Amount Attributable to Parent |  | 1.4 |  | 1.7 |  | 1.5
Net periodic benefit cost (income) |  | 1.6 |  | 2.1 |  | 1.5
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.1 |  | 0.1 |  | 0.2
Interest cost |  | $ 5.2 |  | $ 5.2 |  | $ 3.5
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) |  | $ (1.7) |  | $ (1.8)
Amortization of net loss (gain) |  | $ (0.2) |  | $ (0.2) |  | $ 1.5
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 |  | $ 0.0 |  | $ (3.8)
Total net periodic benefit cost (income) |  | 3.5 |  | 3.4 |  | (0.4)
Net periodic benefit cost (income) |  | 3.5 |  | 3.4 |  | (0.4)
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 | [4] | 2.3 |  | 4.4 |  | 0.6
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 |  | $ 3.9 |  | $ 2.7
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 |  | $ (1.4) |  | $ (1.6) |  | $ (1.6)
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 (gain) |  | $ 0.0 |  | $ 0.0 |  | $ 1.5
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 |  | $ 0.0 |  | $ (3.6)
Total net periodic benefit cost (income) |  | 2.6 |  | 2.4 |  | (0.9)
Amount Attributable to Parent |  | 0.5 |  | 0.5 |  | 0.0
Net periodic benefit cost (income) |  | $ 3.1 |  | $ 2.9 |  | $ (0.9)
[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] | Included in the pension regulatory asset, as indicated in the regulatory assets and liabilities table in Note 1.

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