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v3.23.1

Retirement Plans and Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | $ 1.4 | $ 2.2
Interest cost |  | 4.0 | 3.4
Expected return on plan assets |  | (4.0) | (6.8)
Amortization of net loss |  | 2.2 | 1.9
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | 0.0 | 0.0
Settlement cost |  | 18.2 | 13.2
Total net periodic benefit cost |  | 21.8 | 13.9
Capitalized portion of net periodic pension benefit cost |  | 0.6 | 0.8
Other Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 0.3 | 0.3
Interest cost |  | 0.0 | 0.0
Expected return on plan assets |  | 0.0 | 0.0
Amortization of net loss |  | 0.0 | 0.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | 0.1 | 0.1
Settlement cost |  | 0.0 | 0.0
Total net periodic benefit cost |  | 0.4 | 0.4
Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 0.0 | 0.1
Interest cost |  | 1.3 | 0.9
Expected return on plan assets |  | (0.4) | (0.4)
Amortization of net loss |  | (0.1) | 0.5
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [2] | 0.0 | (1.0)
Capitalized portion of net periodic pension benefit cost |  | 0.0 | 0.1
Postretirement Benefit Costs |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Total net periodic benefit cost |  | 0.8 | 0.1
Net periodic benefit cost |  | 0.8 | 0.1
OG&E [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 1.1 | 1.7
Interest cost |  | 3.1 | 2.6
Expected return on plan assets |  | (3.2) | (5.3)
Amortization of net loss |  | 1.9 | 1.6
Settlement cost |  | 17.2 | 3.6
Total net periodic benefit cost |  | 20.1 | 4.2
Net periodic benefit cost |  | 21.7 | 6.0
Capitalized portion of net periodic pension benefit cost |  | 0.5 | 0.7
Amount Attributable to Parent |  | 1.6 | 1.8
OG&E [Member] | Other Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 0.0 | 0.0
Interest cost |  | 0.0 | 0.0
Expected return on plan assets |  | 0.0 | 0.0
Amortization of net loss |  | 0.0 | 0.0
Settlement cost |  | 0.0 | 0.0
Total net periodic benefit cost |  | 0.0 | 0.0
Net periodic benefit cost |  | 0.4 | 0.4
Amount Attributable to Parent |  | 0.4 | 0.4
OG&E [Member] | Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 0.0 | 0.0
Interest cost |  | 1.0 | 0.7
Expected return on plan assets |  | (0.4) | (0.4)
Amortization of net loss |  | 0.0 | 0.5
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [2] | 0.0 | (0.9)
Capitalized portion of net periodic pension benefit cost |  | 0.0 | 0.0
OG&E [Member] | Postretirement Benefit Costs |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Total net periodic benefit cost |  | 0.6 | (0.1)
Net periodic benefit cost |  | 0.7 | (0.1)
Amount Attributable to Parent |  | 0.1 | 0.0
OKLAHOMA | Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Settlement cost | [3] | 16.7 | 4.7
Additional Pension Expense to Meet State Requirements | [3] | 20.2 | 1.9
OKLAHOMA | Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Additional Pension Expense to Meet State Requirements | [4] | 1.1 | (0.3)
ARKANSAS | Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Settlement cost | [3] | $ 1.5 | $ 0.4
[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] | 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.
[3] | Included in the pension regulatory asset in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
[4] | Included in the pension regulatory asset or liability in each jurisdiction, as presented 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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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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