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v3.22.2

Retirement Plans and Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Service cost |  | $ 1.7 | $ 2.6 | $ 3.9 |  | $ 5.6 |
Interest cost |  | 4.3 | 3.4 | 7.7 |  | 6.9 |
Expected return on plan assets |  | (6.2) | (8.7) | (13.0) |  | (17.1) |
Amortization of net loss |  | 2.3 | 1.9 | 4.2 |  | 4.7 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |  | 0.0 | 0.0 | 0.0 | [1] | 0.0 | [1]
Settlement cost |  | 2.8 | 5.3 | 16.0 |  | 31.7 |
Total net periodic benefit cost |  | 4.9 | 4.5 | 18.8 |  | 31.8 |
Amount Attributable to Unconsolidated Affiliates |  | 0.0 | (0.2) | 0.0 |  | (0.1) |
Net periodic benefit cost |  | 4.9 | 4.7 | 18.8 |  | 31.9 |
Capitalized portion of net periodic pension benefit cost |  | 0.7 | 0.8 | 1.5 |  | 1.6 |
Other Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Service cost |  | 0.2 | 0.2 | 0.5 |  | 0.3 |
Interest cost |  | 0.1 | 0.1 | 0.1 |  | 0.1 |
Expected return on plan assets |  | 0.0 | 0.0 | 0.0 |  | 0.0 |
Amortization of net loss |  | 0.1 | 0.0 | 0.1 |  | 0.1 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |  | 0.0 | 0.0 | 0.1 | [1] | 0.0 | [1]
Settlement cost |  | 0.2 | 0.4 | 0.2 |  | 0.4 |
Total net periodic benefit cost |  | 0.6 | 0.7 | 1.0 |  | 0.9 |
Amount Attributable to Unconsolidated Affiliates |  | 0.0 | 0.0 | 0.0 |  | 0.0 |
Net periodic benefit cost |  | 0.6 | 0.7 | 1.0 |  | 0.9 |
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 |  | 0.9 | 0.9 | 1.8 |  | 1.7 |
Expected return on plan assets |  | (0.5) | (0.5) | (0.9) |  | (1.0) |
Amortization of net loss |  | 0.2 | 0.7 | 0.7 |  | 1.4 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | (0.9) | (1.7) | (1.9) |  | (3.4) |
Amount Attributable to Unconsolidated Affiliates |  | 0.0 | (0.2) | 0.0 | [2] | (0.3) | [2]
Capitalized portion of net periodic pension benefit cost |  | 0.0 | 0.0 | 0.1 |  | 0.1 |
Postretirement Benefit Costs |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Total net periodic benefit cost |  | (0.3) | (0.6) | (0.2) |  | (1.2) |
Net periodic benefit cost |  | (0.3) | (0.4) | (0.2) |  | (0.9) |
OG&E [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Service cost |  | 1.4 | 1.7 | 3.1 |  | 3.8 |
Interest cost |  | 3.3 | 2.5 | 5.9 |  | 5.0 |
Expected return on plan assets |  | (4.7) | (6.2) | (10.0) |  | (12.3) |
Amortization of net loss |  | 1.9 | 1.5 | 3.5 |  | 3.5 |
Settlement cost |  | 2.1 | 4.4 | 5.7 |  | 26.6 |
Total net periodic benefit cost |  | 4.0 | 3.9 | 8.2 |  | 26.6 |
Net periodic benefit cost |  | 4.4 | 4.6 | 10.4 |  | 31.2 |
Capitalized portion of net periodic pension benefit cost |  | 0.5 | 0.7 | 1.2 |  | 1.4 |
Amount Attributable to Parent |  | 0.4 | 0.7 | 2.2 |  | 4.6 |
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 | 0.1 | 0.0 |  | 0.1 |
Settlement cost |  | 0.0 | 0.3 | 0.0 |  | 0.3 |
Total net periodic benefit cost |  | 0.0 | 0.4 | 0.0 |  | 0.4 |
Net periodic benefit cost |  | 0.3 | 0.7 | 0.7 |  | 0.9 |
Amount Attributable to Parent |  | 0.3 | 0.3 | 0.7 |  | 0.5 |
OG&E [Member] | Postretirement Benefit Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Service cost |  | 0.1 | 0.0 | 0.1 |  | 0.1 |
Interest cost |  | 0.6 | 0.7 | 1.3 |  | 1.3 |
Expected return on plan assets |  | (0.4) | (0.5) | (0.8) |  | (0.9) |
Amortization of net loss |  | 0.3 | 0.7 | 0.8 |  | 1.4 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |  | (0.9) | (1.2) | (1.8) | [1] | (2.5) | [1]
Capitalized portion of net periodic pension benefit cost |  | 0.1 | 0.1 | 0.1 |  | 0.1 |
Amount Attributable to Parent |  | 0.0 | (0.1) | 0.0 | [2] | (0.2) | [2]
OG&E [Member] | Postretirement Benefit Costs |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Total net periodic benefit cost |  | (0.3) | (0.3) | (0.4) |  | (0.6) |
Net periodic benefit cost |  | (0.3) | (0.4) | (0.4) |  | (0.8) |
OKLAHOMA | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Settlement cost | [3] | 2.0 | 5.2 | 6.7 |  | 28.9 |
Additional Pension Expense to Meet State Requirements | [3] | 0.4 | 0.9 | 2.3 |  | 21.6 |
OKLAHOMA | Postretirement Benefit Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Additional Pension Expense to Meet State Requirements | [4] | 0.1 | 0.1 | (0.2) |  | 0.2 |
ARKANSAS | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |
Settlement cost | [3] | $ 0.2 | $ 0.5 | $ 0.6 |  | $ 2.7 |
[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 or liability 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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