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v3.22.2.2

Retirement Plans and Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | $ 1.8 | $ 2.8 | $ 5.7 | $ 8.4
Interest cost |  | 4.1 | 3.1 | 11.8 | 10.0
Expected return on plan assets |  | (6.0) | (8.5) | (19.0) | (25.6)
Amortization of net loss |  | 2.4 | 2.3 | 6.6 | 7.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | 0.0 | 0.0 | 0.0 | 0.0
Settlement cost |  | 2.3 | 3.7 | 18.3 | 35.4
Total net periodic benefit cost |  | 4.6 | 3.4 | 23.4 | 35.2
Amount Attributable to Unconsolidated Affiliates |  | 0.0 | (0.1) | 0.0 | (0.2)
Net periodic benefit cost |  | 4.6 | 3.5 | 23.4 | 35.4
Capitalized portion of net periodic pension benefit cost |  | 0.7 | 0.9 | 2.2 | 2.5
Other Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 0.3 | 0.3 | 0.8 | 0.6
Interest cost |  | 0.0 | 0.0 | 0.1 | 0.1
Expected return on plan assets |  | 0.0 | 0.0 | 0.0 | 0.0
Amortization of net loss |  | 0.0 | 0.0 | 0.1 | 0.1
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | 0.1 | 0.1 | 0.2 | 0.1
Settlement cost |  | 0.0 | 1.7 | 0.2 | 2.1
Total net periodic benefit cost |  | 0.4 | 2.1 | 1.4 | 3.0
Amount Attributable to Unconsolidated Affiliates |  | 0.0 | 0.0 | 0.0 | 0.0
Net periodic benefit cost |  | 0.4 | 2.1 | 1.4 | 3.0
Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 0.0 | 0.1 | 0.1 | 0.2
Interest cost |  | 0.9 | 0.9 | 2.7 | 2.6
Expected return on plan assets |  | (0.5) | (0.4) | (1.4) | (1.4)
Amortization of net loss |  | 0.5 | 0.7 | 1.2 | 2.1
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | (1.0) | (1.8) | (2.9) | (5.2)
Amount Attributable to Unconsolidated Affiliates | [2] | 0.0 | (0.1) | 0.0 | (0.4)
Capitalized portion of net periodic pension benefit cost |  | 0.1 | 0.1 | 0.2 | 0.2
Postretirement Benefit Costs |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Total net periodic benefit cost |  | (0.1) | (0.5) | (0.3) | (1.7)
Net periodic benefit cost |  | (0.1) | (0.4) | (0.3) | (1.3)
OG&E [Member] | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 1.5 | 2.0 | 4.6 | 5.8
Interest cost |  | 3.1 | 2.3 | 9.0 | 7.3
Expected return on plan assets |  | (4.7) | (6.2) | (14.7) | (18.5)
Amortization of net loss |  | 2.1 | 1.7 | 5.6 | 5.2
Settlement cost |  | 0.4 | 2.6 | 6.1 | 29.2
Total net periodic benefit cost |  | 2.4 | 2.4 | 10.6 | 29.0
Net periodic benefit cost |  | 2.8 | 3.1 | 13.2 | 34.3
Capitalized portion of net periodic pension benefit cost |  | 0.7 | 0.7 | 1.9 | 2.1
Amount Attributable to Parent |  | 0.4 | 0.7 | 2.6 | 5.3
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 |  | 0.0 | 0.0 | 0.0 | 0.0
Expected return on plan assets |  | 0.0 | 0.0 | 0.0 | 0.0
Amortization of net loss |  | 0.0 | 0.0 | 0.0 | 0.1
Settlement cost |  | 0.0 | 1.3 | 0.0 | 1.6
Total net periodic benefit cost |  | 0.0 | 1.3 | 0.0 | 1.7
Net periodic benefit cost |  | 0.4 | 2.1 | 1.1 | 3.0
Amount Attributable to Parent |  | 0.4 | 0.8 | 1.1 | 1.3
OG&E [Member] | Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Service cost |  | 0.0 | 0.0 | 0.1 | 0.1
Interest cost |  | 0.7 | 0.6 | 2.0 | 1.9
Expected return on plan assets |  | (0.4) | (0.4) | (1.2) | (1.3)
Amortization of net loss |  | 0.3 | 0.6 | 1.1 | 2.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | (0.9) | (1.2) | (2.7) | (3.7)
Capitalized portion of net periodic pension benefit cost |  | 0.0 | 0.0 | 0.1 | 0.1
Amount Attributable to Parent | [2] | 0.0 | (0.1) | 0.0 | (0.3)
OG&E [Member] | Postretirement Benefit Costs |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Total net periodic benefit cost |  | (0.3) | (0.4) | (0.7) | (1.0)
Net periodic benefit cost |  | (0.3) | (0.5) | (0.7) | (1.3)
OKLAHOMA | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Settlement cost | [3] | 0.3 | 4.4 | 7.0 | 33.3
Additional Pension Expense to Meet State Requirements | [3] | 2.7 | 0.5 | 5.0 | 22.2
OKLAHOMA | Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Additional Pension Expense to Meet State Requirements | [4] | (0.2) | 0.1 | (0.4) | 0.3
ARKANSAS | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Settlement cost | [3] | $ 0.1 | $ 0.4 | $ 0.7 | $ 3.1
[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] | "Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.
[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 tracker, as presented in the regulatory assets and liabilities table in Note 1.

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