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Retirement Plans and Postretirement Benefit Plans Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Employer contributions |  | $ 15.0 |  | $ 20.0 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Settlement |  | 26.1 |  | 15.3 | $ 8.6 |
Net periodic benefit cost |  | 35.4 |  | 32.9 | 22.5 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Level 3 Asset Value, Beginning of Period |  | 40.2 |  |  |  |
Interest income |  | 0.7 |  |  |  |
Dividend income |  | 0.5 |  |  |  |
Unrealized gains |  | (0.5) |  |  |  |
Realized losses |  | (0.2) |  |  |  |
Administrative expenses and charges |  | (0.1) |  |  |  |
Claims paid |  | (4.6) |  |  |  |
Level 3 Asset Value, End of Period |  | 36.0 |  | 40.2 |  |
Postretirement Plan, Expected Future Benefit Payments, Next Twelve Months |  | 11.6 |  |  |  |
Postretirement Plan, Expected Future Benefit Payments, Year Two |  | 11.6 |  |  |  |
Postretirement Plan, Expected Future Benefit Payments, Year Three |  | 11.6 |  |  |  |
Postretirement Plan, Expected Future Benefit Payments in Year Four |  | 11.6 |  |  |  |
Postretirement Plan, Expected Future Benefit Payments, Year Five |  | 10.2 |  |  |  |
Postretirement Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter |  | 46.7 |  |  |  |
Postemployment Benefits Liability |  | 1.9 |  | 2.5 |  |
Cash [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 0.5 |  |  |  |
Fair Value of Plan Assets, Ending |  |  |  | 0.5 |  |
Fair Value, Inputs, Level 1 [Member] | Cash [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 0.5 |  |  |  |
Fair Value of Plan Assets, Ending |  |  |  | 0.5 |  |
Fair Value, Inputs, Level 3 [Member] | Cash [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 0.0 |  |  |  |
Fair Value of Plan Assets, Ending |  |  |  | 0.0 |  |
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit Obligation, Beginning |  | 687.5 |  | 672.2 |  |
Service cost |  | 14.9 |  | 15.5 | 15.8 |
Interest cost |  | 23.8 |  | 26.2 | 25.5 |
Plan settlements |  | (73.7) |  | (50.2) |  |
Actuarial gains (losses) |  | (22.0) |  | 38.6 |  |
Benefit Obligation, Ending |  | 615.9 |  | 687.5 | 672.2 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 635.3 |  | 595.9 |  |
Actual return on plans' assets |  | (39.2) |  | 84.4 |  |
Employer contributions |  | 15.0 |  | 20.0 |  |
Plan settlements |  | (73.7) |  | (50.2) |  |
Fair Value of Plan Assets, Ending |  | 522.8 |  | 635.3 | 595.9 |
Funded Status of Plan |  | (93.1) |  | (52.2) |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  | 14.9 |  | 15.5 | 15.8 |
Interest cost |  | 23.8 |  | 26.2 | 25.5 |
Expected return on plan assets |  | (44.1) |  | (42.6) | (41.5) |
Amortization of unrecognized prior service cost |  | 0.0 |  | (0.1) | (0.1) | [1]
Settlement |  | 25.1 |  | 15.3 | 0.0 |
Net periodic benefit cost |  | 35.9 |  | 31.7 | 16.2 |
Amount paid by unconsolidated affiliates |  | 2.5 |  | 4.3 | 5.1 |
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates | [2] | 33.4 |  | 27.4 | 11.1 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Capitalized Portion of Net Periodic Benefit Cost |  | $ 3.8 |  | $ 4.4 | $ 4.0 |
Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 4.20% |  | 3.60% | 4.00% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate |  | 3.73% |  | 4.00% | 4.00% |
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets |  | 7.50% |  | 7.50% | 7.50% |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase |  | 4.20% |  | 4.20% | 4.20% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |  | 4.20% |  | 4.20% | 4.20% |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | $ (14.6) |  | $ (14.8) |  |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  |  |  |  | $ 0.0 |
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit Obligation, Beginning |  | 149.4 |  | 215.9 |  |
Service cost |  | 0.3 |  | 0.6 | 0.8 |
Interest cost |  | 5.4 |  | 7.2 | 9.5 |
Plan settlements |  | 0.0 |  | (28.1) |  |
Actuarial gains (losses) |  | (9.6) |  | 5.6 |  |
Benefit Obligation, Ending |  | 135.8 |  | 149.4 | 215.9 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 50.2 |  | 53.1 |  |
Actual return on plans' assets |  | (0.6) |  | 2.8 |  |
Employer contributions |  | 5.4 |  | 34.6 |  |
Plan settlements |  | 0.0 |  | (28.1) |  |
Fair Value of Plan Assets, Ending |  | 45.3 |  | 50.2 | 53.1 |
Funded Status of Plan |  | (90.5) |  | (99.2) |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |
Service cost |  | 0.3 |  | 0.6 | 0.8 |
Interest cost |  | 5.4 |  | 7.2 | 9.5 |
Expected return on plan assets |  | (2.0) |  | (2.2) | (2.3) |
Amortization of unrecognized prior service cost |  | (8.4) |  | (3.5) | (8.8) | [1]
Settlement |  | 0.0 |  | 0.6 | 0.0 |
Net periodic benefit cost |  | (0.9) |  | 4.7 | 1.8 |
Amount paid by unconsolidated affiliates |  | (0.5) |  | 0.3 | 0.2 |
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates | [2] | (0.4) |  | 4.4 | 1.6 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Capitalized Portion of Net Periodic Benefit Cost |  | $ 0.2 |  | $ 1.2 | $ 0.8 |
Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 4.30% |  | 3.70% | 4.20% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate |  | 3.70% |  | 4.20% | 4.25% |
Health Care Cost Trend Rate Assumed for Next Fiscal Year |  | 7.25% |  |  |  |
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets |  | 4.00% |  | 4.00% | 4.00% |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase |  |  |  |  | 4.20% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |  |  |  | 4.20% | 4.20% |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | $ (13.5) |  | $ (15.7) |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Group Retiree Medical Insurance Contract [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 40.2 |  |  |  |
Fair Value of Plan Assets, Ending |  | 36.0 |  | 40.2 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | U.S. Equity Mutual Funds Investment [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 9.5 |  |  |  |
Fair Value of Plan Assets, Ending |  | 8.9 |  | 9.5 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Ending |  | 0.9 |  |  |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 10.0 |  |  |  |
Fair Value of Plan Assets, Ending |  | 9.8 |  | 10.0 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Group Retiree Medical Insurance Contract [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 0.0 |  |  |  |
Fair Value of Plan Assets, Ending |  | 0.0 |  | 0.0 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Equity Mutual Funds Investment [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 9.5 |  |  |  |
Fair Value of Plan Assets, Ending |  | 8.9 |  | 9.5 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Cash [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Ending |  | 0.9 |  |  |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 0.0 |  |  |  |
Fair Value of Plan Assets, Ending |  | 0.0 |  | 0.0 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 40.2 |  |  |  |
Fair Value of Plan Assets, Ending |  | 36.0 |  | 40.2 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Group Retiree Medical Insurance Contract [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 40.2 |  |  |  |
Fair Value of Plan Assets, Ending |  | 36.0 |  | 40.2 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Equity Mutual Funds Investment [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 0.0 |  |  |  |
Fair Value of Plan Assets, Ending |  | 0.0 |  | 0.0 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Cash [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Ending |  | 0.0 |  |  |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning |  | 50.2 |  |  |  |
Fair Value of Plan Assets, Ending |  | 45.8 |  | 50.2 |  |
OKLAHOMA | Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Additional Postretirement Medical Expense to Meet State Requirements |  | 4.4 |  | 6.2 | $ 7.9 |
Equity Funds [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning | [3] | 29.9 |  |  |  |
Fair Value of Plan Assets, Ending | [3] | 19.7 | [4] | 29.9 |  |
Equity Funds [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning | [3] | 0.0 |  |  |  |
Fair Value of Plan Assets, Ending | [3] | 0.0 |  | 0.0 |  |
Equity Funds [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Plan Assets, Beginning | [3] | 0.0 |  |  |  |
Fair Value of Plan Assets, Ending | [3] | $ 0.0 |  | $ 0.0 |  |
[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] | In addition to the $35.4 million, $32.9 million and $22.5 million of net periodic benefit cost recognized in 2018, 2017 and 2016, respectively, OG&E recognized the following: •a change in pension expense in 2018, 2017 and 2016 of $(14.1) million, $(2.3) million and $9.9 million, respectively, to maintain the allowable amount to be recovered for pension expense in the Oklahoma jurisdiction, which are included in the Pension tracker regulatory asset or liability (see Note 1); •an increase in postretirement medical expense in 2018, 2017 and 2016 of $4.4 million, $6.2 million and $7.9 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 asset or liability (see Note 1); and •a deferral of pension expense in 2018, 2017 and 2016 of $2.1 million, $1.1 million and $0.1 million related to the Arkansas jurisdictional portion of the pension settlement charge of $26.1 million, $15.3 million and $8.6 million, respectively, which are included in the Arkansas deferred pension expense regulatory asset (see Note 1).
[3] | This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
[4] | GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.

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