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Retirement Plans and Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 2019
Defined Benefit Plan [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Retirement Plans and Postretirement Benefit Plans In accordance with ASC Topic 715, "Compensation - Retirement Benefits," a one-time settlement charge is required to be recorded by an organization when lump sum payments or other settlements that relieve the organization from the responsibility for the pension benefit obligation during the plan year exceed the service cost and interest cost components of the organization's net periodic pension cost. During the first nine months of 2019, the Company experienced an increase in both the number of employees electing to retire and the amount of lump sum payments paid to such employees upon retirement, which resulted in the Company recording pension settlement charges of $23.8 million. The pension settlement charge did not require a cash outlay by the Company and did not increase the Company's total pension expense over time, as the charge was an acceleration of costs that otherwise would be recognized as pension expense in future periods. Net Periodic Benefit Cost The following table presents the net periodic benefit cost components, before consideration of capitalized amounts, of the Company's Pension Plan, Restoration of Retirement Income Plan and postretirement benefit plans that are included in the Condensed Consolidated Financial Statements. Service cost is presented within Other Operation and Maintenance, and interest cost, expected return on plan assets, amortization of net loss, amortization of unrecognized prior service cost and settlement cost are presented within Other Net Periodic Benefit Expense in the Company's Condensed Consolidated Statements of Income. OG&E recovers specific amounts of pension and postretirement medical costs in rates approved in its Oklahoma rate reviews. In accordance with approved orders, OG&E defers the difference between actual pension and postretirement medical expenses and the amount approved in its last Oklahoma rate review as a regulatory asset or regulatory liability. These amounts have been recorded in the Pension tracker in the regulatory assets and liabilities table in Note 1 and within Other Net Periodic Benefit Expense in the Company's Condensed Consolidated Statements of Income.
| Pension Plan |  | Restoration of Retirement Income Plan
| Three Months Ended | Nine Months Ended |  | Three Months Ended | Nine Months Ended
| September 30, | September 30, |  | September 30, | September 30,
(In millions) | 2019 | 2018 | 2019 | 2018 |  | 2019 | 2018 | 2019 | 2018
Service cost | $ | 3.4 |  | $ | 3.6 |  | $ | 9.7 |  | $ | 11.1 |  |  | $ | 0.1 |  | $ | 0.1 |  | $ | 0.3 |  | $ | 0.3 |
Interest cost | 4.6 |  | 6.1 |  | 15.5 |  | 17.8 |  |  | 0.1 |  | 0.1 |  | 0.3 |  | 0.3 |
Expected return on plan assets | (9.5 | ) | (10.7 | ) | (27.1 | ) | (33.0 | ) |  | — |  | — |  | — |  | — |
Amortization of net loss | 4.4 |  | 3.9 |  | 13.0 |  | 12.2 |  |  | 0.1 |  | 0.1 |  | 0.3 |  | 0.5 |
Amortization of unrecognized prior service cost (A) | — |  | — |  | — |  | — |  |  | — |  | 0.1 |  | — |  | 0.1 |
Settlement cost | 2.8 |  | 12.2 |  | 23.4 |  | 12.2 |  |  | 0.4 |  | 0.6 |  | 0.4 |  | 0.6 |
Total net periodic benefit cost | 5.7 |  | 15.1 |  | 34.5 |  | 20.3 |  |  | 0.7 |  | 1.0 |  | 1.3 |  | 1.8 |
Less: Amount paid by unconsolidated affiliates | 0.5 |  | 0.7 |  | 2.2 |  | 1.9 |  |  | 0.1 |  | 0.1 |  | 0.1 |  | 0.1 |
Net periodic benefit cost | $ | 5.2 |  | $ | 14.4 |  | $ | 32.3 |  | $ | 18.4 |  |  | $ | 0.6 |  | $ | 0.9 |  | $ | 1.2 |  | $ | 1.7 |
(A) | 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.
In addition to the net periodic benefit cost amounts presented in the above table for the three and nine months ended September 30, 2019 and 2018, the Company also recognized the following:
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2019 | 2018 | 2019 | 2018
Increase (decrease) of pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | $ | 1.5 |  | $ | — |  | $ | (0.2 | ) | $ | 7.8 |
Deferral of pension expense related to pension settlement charges: |  |  |  |
Oklahoma jurisdiction (A) | $ | 2.3 |  | $ | 10.5 |  | $ | 14.0 |  | $ | 10.5 |
Arkansas jurisdiction (A) | $ | 0.2 |  | $ | 1.0 |  | $ | 1.3 |  | $ | 1.0 |
(A) | Included in the Pension tracker regulatory liability for the Oklahoma jurisdiction and in the deferred pension expenses regulatory asset for the Arkansas jurisdiction (see Note 1).
| Postretirement Benefit Plans
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2019 | 2018 | 2019 | 2018
Service cost | $ | 0.1 |  | $ | — |  | $ | 0.2 |  | $ | 0.2 |
Interest cost | 1.2 |  | 1.5 |  | 4.2 |  | 4.1 |
Expected return on plan assets | (0.5 | ) | (0.5 | ) | (1.4 | ) | (1.5 | )
Amortization of net loss | 0.5 |  | 1.0 |  | 1.5 |  | 2.9 |
Amortization of unrecognized prior service cost (A) | (2.1 | ) | (2.1 | ) | (6.3 | ) | (6.3 | )
Total net periodic benefit cost | (0.8 | ) | (0.1 | ) | (1.8 | ) | (0.6 | )
Less: Amount paid by unconsolidated affiliates | (0.2 | ) | (0.2 | ) | (0.5 | ) | (0.4 | )
Net periodic benefit cost | $ | (0.6 | ) | $ | 0.1 |  | $ | (1.3 | ) | $ | (0.2 | )
(A) | 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.
In addition to the net periodic benefit income and cost amounts presented in the above table for the three and nine months ended September 30, 2019 and 2018, the Company also recognized the following:
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2019 | 2018 | 2019 | 2018
Increase of postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | $ | 0.1 |  | $ | 0.1 |  | $ | 0.9 |  | $ | 4.3 |
(A) | Included in the Pension tracker regulatory liability (see Note 1).
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2019 | 2018 | 2019 | 2018
Capitalized portion of net periodic pension benefit cost | $ | 0.9 |  | $ | 0.9 |  | $ | 2.7 |  | $ | 2.8 |
Capitalized portion of net periodic postretirement benefit cost | $ | — |  | $ | — |  | $ | 0.1 |  | $ | 0.1 |
Pension Plan Funding In August 2019, the Company contributed $20.0 million to its Pension Plan. No additional contributions are expected in 2019.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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