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Retirement Plans and Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2026 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Employer contribution paid |  | $ 5.0 |  |  |  |
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  |  | $ 1.2 | $ 1.3 | $ 2.6 | $ 2.7
Interest cost |  |  | $ 4.0 | $ 4.1 | $ 7.9 | $ 8.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Expected return on plan assets |  |  | $ (4.6) | $ (4.2) | $ (8.7) | $ (8.3)
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Amortization of net (gain) loss |  |  | $ 1.4 | $ 1.6 | $ 3.0 | $ 3.1
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Amortization of unrecognized prior service cost | [1] |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Net periodic benefit cost |  |  | 2.0 | 2.8 | 4.8 | 5.6
Capitalized portion of net periodic pension benefit cost |  |  | 0.6 | 0.6 | 1.2 | 1.2
Other Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  |  | 0.3 | 0.2 | 0.6 | 0.5
Interest cost |  |  | $ 0.2 | $ 0.1 | $ 0.3 | $ 0.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Expected return on plan assets |  |  | $ 0.0 | $ 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Amortization of net (gain) loss |  |  | $ 0.0 | $ 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Amortization of unrecognized prior service cost | [1] |  | $ 0.0 | $ 0.2 | $ 0.1 | $ 0.2
Net periodic benefit cost |  |  | 0.5 | 0.5 | 1.0 | 0.9
Postretirement Benefit Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  |  | 0.0 | 0.0 | 0.0 | 0.0
Interest cost |  |  | 1.0 | 1.4 | 2.2 | 2.7
Expected return on plan assets |  |  | (0.3) | (0.4) | (0.7) | (0.8)
Amortization of net (gain) loss |  |  | (0.1) | 0.2 | (0.1) | 0.2
Total net periodic benefit cost |  |  | 0.6 | 1.2 | 1.4 | 2.1
Net periodic benefit cost |  |  | 0.6 | 1.2 | 1.4 | 2.1
Capitalized portion of net periodic pension benefit cost |  |  | 0.0 | 0.0 | 0.0 | 0.0
OG&E [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  |  | 1.2 | 1.3 | 2.6 | 2.7
Interest cost |  |  | $ 3.4 | $ 3.6 | $ 6.8 | $ 7.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Expected return on plan assets |  |  | $ (3.9) | $ (3.6) | $ (7.5) | $ (7.1)
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Amortization of net (gain) loss |  |  | $ 1.3 | $ 1.5 | $ 2.8 | $ 2.9
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Total net periodic benefit cost |  |  | $ 2.0 | $ 2.8 | $ 4.7 | $ 5.6
Plus: Amount allocated from OGE Energy |  |  | 0.0 | 0.0 | 0.0 | 0.0
Net periodic benefit cost |  |  | 2.0 | 2.8 | 4.7 | 5.6
Capitalized portion of net periodic pension benefit cost |  |  | 0.6 | 0.6 | 1.2 | 1.2
OG&E [Member] | Other Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  |  | 0.0 | 0.0 | 0.0 | 0.0
Interest cost |  |  | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Expected return on plan assets |  |  | $ 0.0 | $ 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Amortization of net (gain) loss |  |  | $ 0.0 | $ 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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Total net periodic benefit cost |  |  | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1
Plus: Amount allocated from OGE Energy |  |  | 0.5 | 0.4 | 0.9 | 0.8
Net periodic benefit cost |  |  | 0.6 | 0.5 | 1.0 | 0.9
OG&E [Member] | Postretirement Benefit Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  |  | 0.0 | 0.0 | 0.0 | 0.0
Interest cost |  |  | 0.8 | 1.1 | 1.7 | 2.1
Expected return on plan assets |  |  | (0.3) | (0.3) | (0.6) | (0.7)
Amortization of net (gain) loss |  |  | 0.0 | 0.2 | 0.0 | 0.3
Total net periodic benefit cost |  |  | 0.5 | 1.0 | 1.1 | 1.7
Plus: Amount allocated from OGE Energy |  |  | 0.1 | 0.1 | 0.2 | 0.2
Net periodic benefit cost |  |  | 0.6 | 1.1 | 1.3 | 1.9
Capitalized portion of net periodic pension benefit cost |  |  | 0.0 | 0.0 | 0.0 | 0.0
Oklahoma Jurisdiction | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Change in pension/postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | [2] |  | (0.8) | (0.2) | (1.1) | (0.4)
OKLAHOMA | Postretirement Benefit Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Change in pension/postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | [3] |  | $ (0.2) | $ 0.3 | $ (0.2) | $ 0.3
[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, as indicated in the regulatory assets and liabilities table in Note 1.
[3] | Included in the pension regulatory asset, as indicated in the regulatory assets and liabilities table in Note 1.

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