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Retirement Plans and Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 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 quarter 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 a pension settlement charge of $19.7 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 |  | Postretirement Benefit Plans
| Three Months Ended |  | Three Months Ended |  | Three Months Ended
| March 31, |  | March 31, |  | March 31,
(In millions) | 2019 (B) | 2018 (B) |  | 2019 (B) | 2018 (B) |  | 2019 (B) | 2018 (B)
Service cost | $ | 3.5 |  | $ | 4.1 |  |  | $ | 0.1 |  | $ | 0.1 |  |  | $ | 0.1 |  | $ | 0.1 |
Interest cost | 5.7 |  | 5.9 |  |  | 0.1 |  | 0.1 |  |  | 1.4 |  | 1.3 |
Expected return on plan assets | (8.7 | ) | (11.3 | ) |  | — |  | — |  |  | (0.5 | ) | (0.5 | )
Amortization of net loss | 3.8 |  | 3.9 |  |  | 0.1 |  | 0.1 |  |  | 0.6 |  | 1.0 |
Amortization of unrecognized prior service cost (A) | — |  | — |  |  | — |  | — |  |  | (2.1 | ) | (2.1 | )
Settlement cost | 19.7 |  | — |  |  | — |  | — |  |  | — |  | — |
Total net periodic benefit cost | 24.0 |  | 2.6 |  |  | 0.3 |  | 0.3 |  |  | (0.5 | ) | (0.2 | )
Less: Amount paid by unconsolidated affiliates | 0.9 |  | 0.5 |  |  | — |  | — |  |  | (0.2 | ) | (0.1 | )
Net periodic benefit cost | $ | 23.1 |  | $ | 2.1 |  |  | $ | 0.3 |  | $ | 0.3 |  |  | $ | (0.3 | ) | $ | (0.1 | )
(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.
(B) | In addition to the $23.1 million and $2.3 million of net periodic benefit cost recognized during the three months ended March 31, 2019 and 2018, respectively, the Company recognized the following:
• | a decrease of pension expense of $1.0 million and an increase of $4.0 million during the three months ended March 31, 2019 and 2018, respectively, to maintain the allowable amount to be recovered for pension expense in the Oklahoma jurisdiction, which are included in the Pension tracker regulatory liability (see Note 1);
• | an increase in postretirement medical expense during the three months ended March 31, 2019 and 2018 of $0.3 million and $2.1 million, respectively, to maintain the allowable amount to be recovered for postretirement medical expense in the Oklahoma jurisdiction, which are included in the Pension tracker regulatory liability (see Note 1);
• | a deferral of pension expense during the three months ended March 31, 2019 of $11.2 million related to the pension settlement charge of $19.7 million in accordance with the Oklahoma Pension tracker regulatory liability (see Note 1); and
• | a deferral of pension expense during the three months ended March 31, 2019 of $1.0 million related to the Arkansas jurisdictional portion of the pension settlement charge of $19.7 million (see Note 1).
| Three Months Ended
| March 31,
(In millions) | 2019 | 2018
Capitalized portion of net periodic pension benefit cost | $ | 1.0 |  | $ | 1.0 |
Capitalized portion of net periodic postretirement benefit cost | $ | 0.1 |  | $ | — |

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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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