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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | $ 7.6 | $ 11.2 |  | $ 13.2 |
Interest cost |  | $ 15.7 | $ 13.3 |  | $ 17.0 |
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 |  | $ (25.4) | $ (34.1) |  | $ (37.6) |
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 |  | $ 8.9 | $ 9.4 |  | $ 17.1 |
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) |
Curtailment |  | $ 0.0 | $ 0.0 |  | $ 0.0 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment 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) |
Special termination benefits |  | $ 0.0 | $ 0.0 |  | $ 7.6 |
Amortization of unrecognized prior service cost | [1] | 0.0 | 0.0 |  | 0.0 |
Settlement cost |  | 30.6 | 41.3 |  | 14.1 |
Total net periodic benefit cost |  | 37.4 | 41.1 |  | 31.4 |
Less: Amount paid by unconsolidated affiliates |  | (0.0) | (0.2) |  | 2.0 |
Net periodic benefit cost |  | 37.4 | 41.3 |  | 29.4 |
Pension Plan [Member] | Oklahoma Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost | [2] | 15.4 | 37.9 |  | 21.6 |
Increase (decrease) of regulatory liability related to postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction | [2] | 15.2 | 23.0 |  | 13.8 |
Pension Plan [Member] | Arkansas Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost |  | 1.4 | 3.5 | [2] | 2.0 | [2]
Pension Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 6.2 | 7.7 |  | 9.2 |
Interest cost |  | $ 12.1 | $ 9.7 |  | $ 12.6 |
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 |  | $ (19.6) | $ (24.7) |  | $ (27.9) |
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 |  | $ 7.4 | $ 7.0 |  | $ 12.1 |
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) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment 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) |
Special termination benefits |  | $ 0.0 | $ 0.0 |  | $ 5.1 |
Settlement cost |  | 12.9 | 33.1 |  | 11.4 |
Total net periodic benefit cost |  | 19.0 | 32.8 |  | 22.5 |
Amount Attributable to Parent |  | 5.2 | 6.5 |  | 5.9 |
Net periodic benefit cost |  | 24.2 | 39.3 |  | 28.4 |
Other Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 1.1 | 0.8 |  | 0.8 |
Interest cost |  | $ 0.2 | $ 0.1 |  | $ 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 |  | $ 0.2 | $ 0.2 |  | $ 0.5 |
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) |
Curtailment |  | $ 0.0 | $ 0.0 |  | $ 0.2 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment 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) |
Special termination benefits |  | $ 0.0 | $ 0.0 |  | $ 0.0 |
Amortization of unrecognized prior service cost | [1] | 0.2 | 0.1 |  | 0.0 |
Settlement cost |  | 0.3 | 2.1 |  | 2.7 |
Total net periodic benefit cost |  | 2.0 | 3.3 |  | 4.4 |
Less: Amount paid by unconsolidated affiliates |  | 0.0 | 0.1 |  | 0.1 |
Net periodic benefit cost |  | 2.0 | 3.2 |  | 4.3 |
Other Pension Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.0 | 0.0 |  | 0.1 |
Interest cost |  | $ 0.0 | $ 0.0 |  | $ 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 |  |  | $ 0.1 |  | $ 0.4 |
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) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment 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) |
Special termination benefits |  | $ 0.0 | $ 0.0 |  | $ 0.0 |
Settlement cost |  | 0.0 | 1.6 |  | 2.4 |
Total net periodic benefit cost |  | 0.0 | 1.7 |  | 3.0 |
Amount Attributable to Parent |  | 1.5 | 1.5 |  | 1.3 |
Net periodic benefit cost |  | 1.5 | 3.2 |  | 4.3 |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.2 | 0.2 |  | 0.2 |
Interest cost |  | $ 3.5 | $ 3.4 |  | $ 4.2 |
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 |  | $ (1.8) | $ (1.8) |  | $ (1.8) |
Amortization of net loss |  | $ 1.5 | $ 2.8 |  | $ 2.0 |
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) |
Curtailment |  | $ 0.0 | $ 0.0 |  | $ (1.5) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment 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] | $ (3.8) | $ (6.9) |  | $ (8.4) |
Total net periodic benefit cost |  | (0.4) | (2.3) |  | (2.3) |
Less: Amount paid by unconsolidated affiliates | [4] | 0.0 | (0.5) |  | (0.7) |
Net periodic benefit cost |  | (0.4) | (1.8) |  | (1.6) |
Other Postretirement Benefits Plan [Member] | Oklahoma Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost | [5] | 0.0 | 0.0 |  | (1.4) |
Increase (decrease) of regulatory liability related to postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction | [5] | (0.6) | 0.4 |  | 1.6 |
Other Postretirement Benefits Plan [Member] | Arkansas Jurisdiction |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement cost | [5] | 0.0 | 0.0 |  | (0.1) |
Other Postretirement Benefits Plan [Member] | Og and E [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  | 0.1 | 0.1 |  | 0.2 |
Interest cost |  | $ 2.7 | $ 2.6 |  | $ 3.2 |
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 |  | $ (1.6) | $ (1.7) |  | $ (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 |  | $ 1.5 | $ 2.7 |  | $ 2.1 |
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) |
Curtailment |  | $ 0.0 | $ 0.0 |  | $ (1.3) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment 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] | $ (3.6) | $ (5.0) |  | $ (6.1) |
Total net periodic benefit cost |  | (0.9) | (1.3) |  | (1.0) |
Amount Attributable to Parent | [4] | 0.0 | (0.5) |  | (0.5) |
Net periodic benefit cost |  | $ (0.9) | $ (1.8) |  | $ (1.5) |
[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 or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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