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Retirement Plans and Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | $ 1.3 | $ 1.3 | $ 4.0 | $ 4.0
Interest cost |  | $ 3.9 | $ 4.1 | $ 11.7 | $ 12.0
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Expected return on plan assets |  | $ (4.2) | $ (4.0) | $ (12.4) | $ (12.2)
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 |  | $ 1.7 | $ 1.8 | $ 4.9 | $ 6.0
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 | $ 0.0 | $ 0.0 | $ 0.0
Settlement cost |  | 0.0 | 1.7 | 0.0 | 21.1
Net periodic benefit cost |  | 2.7 | 4.9 | 8.2 | 30.9
Capitalized portion of net periodic pension benefit cost |  | 0.5 | 0.6 | 1.6 | 1.7
Other Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 0.3 | 0.2 | 0.8 | 0.7
Interest cost |  | $ 0.0 | $ 0.1 | $ 0.2 | $ 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) | 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] | $ 0.1 | $ 0.1 | $ 0.2 | $ 0.3
Settlement cost |  | 0.0 | 0.1 | 0.0 | 0.1
Net periodic benefit cost |  | 0.4 | 0.5 | 1.2 | 1.3
Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 0.0 | 0.1 | 0.0 | 0.1
Interest cost |  | 1.3 | 1.3 | 3.9 | 3.9
Expected return on plan assets |  | (0.4) | (0.5) | (1.2) | (1.3)
Amortization of net (gain) loss |  | 0.0 | (0.1) | (0.1) | (0.2)
Total net periodic benefit cost |  | 0.9 | 0.8 | 2.6 | 2.5
Net periodic benefit cost |  | 0.9 | 0.8 | 2.6 | 2.5
Capitalized portion of net periodic pension benefit cost |  | 0.0 | 0.0 | 0.1 | 0.1
OG&E [Member] | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 1.3 | 1.1 | 4.0 | 3.3
Interest cost |  | $ 3.4 | $ 3.1 | $ 10.1 | $ 9.4
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Expected return on plan assets |  | $ (3.5) | $ (3.1) | $ (10.5) | $ (9.6)
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Amortization of net (gain) loss |  | $ 1.5 | $ 1.6 | $ 4.6 | $ 5.2
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) | Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Settlement cost |  | $ 0.0 | $ 1.7 | $ 0.0 | $ 19.7
Total net periodic benefit cost |  | 2.7 | 4.4 | 8.2 | 28.0
Plus: Amount allocated from OGE Energy |  | 0.0 | 0.5 | 0.0 | 2.5
Net periodic benefit cost |  | 2.7 | 4.9 | 8.2 | 30.5
Capitalized portion of net periodic pension benefit cost |  | 0.5 | 0.4 | 1.6 | 1.4
OG&E [Member] | Other Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 0.0 | 0.0 | 0.1 | 0.0
Interest cost |  | $ 0.0 | $ 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) | 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)
Settlement cost |  | $ 0.0 | $ 0.1 | $ 0.0 | $ 0.1
Total net periodic benefit cost |  | 0.0 | 0.1 | 0.1 | 0.1
Plus: Amount allocated from OGE Energy |  | 0.4 | 0.4 | 1.1 | 1.1
Net periodic benefit cost |  | 0.4 | 0.5 | 1.2 | 1.2
OG&E [Member] | Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 0.1 | 0.0 | 0.1 | 0.0
Interest cost |  | 1.0 | 0.9 | 3.0 | 2.9
Expected return on plan assets |  | (0.4) | (0.3) | (1.1) | (1.1)
Amortization of net (gain) loss |  | 0.0 | 0.0 | 0.0 | 0.0
Total net periodic benefit cost |  | 0.7 | 0.6 | 2.0 | 1.8
Plus: Amount allocated from OGE Energy |  | 0.1 | 0.1 | 0.3 | 0.4
Net periodic benefit cost |  | 0.8 | 0.7 | 2.3 | 2.2
Capitalized portion of net periodic pension benefit cost |  | 0.0 | 0.0 | 0.1 | 0.1
Oklahoma Jurisdiction | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Settlement cost | [2] | 0.0 | 1.7 | 0.0 | 19.1
Change in postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | [2] | 3.0 | 5.0 | 8.9 | 29.0
Arkansas Jurisdiction | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Settlement cost | [2] | 0.0 | 0.2 | 0.0 | 1.8
OKLAHOMA | Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Change in postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | [3] | $ 1.1 | $ 1.1 | $ 3.3 | $ 3.3
[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 in each jurisdiction, 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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