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v3.22.1

Retirement Plans and Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | $ 2.2 | $ 3.0
Interest cost |  | 3.4 | 3.5
Expected return on plan assets |  | (6.8) | (8.4)
Amortization of net loss |  | 1.9 | 2.8
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | 0.0 | 0.0
Settlement cost |  | 13.2 | 26.4
Total net periodic benefit cost |  | 13.9 | 27.3
Amount Attributable to Unconsolidated Affiliates |  | 0.0 | 0.1
Net periodic benefit cost |  | 13.9 | 27.2
Capitalized portion of net periodic pension benefit cost |  | 0.8 | 0.8
Other Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 0.3 | 0.1
Interest cost |  | 0.0 | 0.0
Expected return on plan assets |  | 0.0 | 0.0
Amortization of net loss |  | 0.0 | 0.1
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | 0.1 | 0.0
Settlement cost |  | 0.0 | 0.0
Total net periodic benefit cost |  | 0.4 | 0.2
Amount Attributable to Unconsolidated Affiliates |  | 0.0 | 0.0
Net periodic benefit cost |  | 0.4 | 0.2
Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 0.1 | 0.1
Interest cost |  | 0.9 | 0.8
Expected return on plan assets |  | (0.4) | (0.5)
Amortization of net loss |  | 0.5 | 0.7
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | (1.0) | (1.7)
Amount Attributable to Unconsolidated Affiliates | [2] | 0.0 | (0.1)
Capitalized portion of net periodic pension benefit cost |  | 0.1 | 0.1
Postretirement Benefit Costs |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Total net periodic benefit cost |  | 0.1 | (0.6)
Net periodic benefit cost |  | 0.1 | (0.5)
OG&E [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 1.7 | 2.1
Interest cost |  | 2.6 | 2.5
Expected return on plan assets |  | (5.3) | (6.1)
Amortization of net loss |  | 1.6 | 2.0
Settlement cost |  | 3.6 | 22.2
Total net periodic benefit cost |  | 4.2 | 22.7
Net periodic benefit cost |  | 6.0 | 26.6
Capitalized portion of net periodic pension benefit cost |  | 0.7 | 0.7
Amount Attributable to Parent |  | 1.8 | 3.9
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 | 0.2
Amount Attributable to Parent |  | 0.4 | 0.2
OG&E [Member] | Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 0.0 | 0.1
Interest cost |  | 0.7 | 0.6
Expected return on plan assets |  | (0.4) | (0.4)
Amortization of net loss |  | 0.5 | 0.7
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] | (0.9) | (1.3)
Capitalized portion of net periodic pension benefit cost |  | 0.0 | 0.0
Amount Attributable to Parent | [2] | 0.0 | (0.1)
OG&E [Member] | Postretirement Benefit Costs |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Total net periodic benefit cost |  | (0.1) | (0.3)
Net periodic benefit cost |  | (0.1) | (0.4)
OKLAHOMA | Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Settlement cost | [3] | 4.7 | 23.7
Additional Pension Expense to Meet State Requirements | [3] | 1.9 | 20.7
OKLAHOMA | Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Additional Pension Expense to Meet State Requirements | [4] | (0.3) | 0.1
ARKANSAS | Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Settlement cost | [3] | $ 0.4 | $ 2.2
[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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