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Stock-Based Compensation - Share-based Compensation, Activity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Equity Instruments Other than Options, Forfeited in Period |  | (8,009) |  |
Total Shareholder Return [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 213,442 | 216,437 | 249,909
Total Shareholder Return [Member] | Og and E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 65,069 | 60,923 | 68,720
Performance Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance |  | 608,375 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | [1] | 213,442 |  |
Equity Instruments Other than Options, Converted in Period | [2] | (161,690) |  |
Equity Instruments Other than Options, Vested in Period |  | (234,672) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (8,009) |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance |  | 652,118 | 608,375 |
Awards Other than Options, Fully Vested | [3] | 234,672 |  |
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value |  | $ 3.7 |  |
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value |  | 28.8 |  |
Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | $ 12.7 |  |
Performance Units [Member] | Og and E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance |  | 170,623 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | [1] | 65,069 |  |
Equity Instruments Other than Options, Converted in Period | [2] | (44,550) |  |
Equity Instruments Other than Options, Vested in Period |  | (63,506) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (5,889) |  |
Equity Other Than Options, Employee Migration | [4] | (1,416) |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance |  | 183,837 | 170,623 |
Awards Other than Options, Fully Vested | [3] | 63,506 |  |
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value |  | $ 1.0 |  |
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value |  | 8.0 |  |
Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | $ 3.4 |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance |  | 189,483 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 114,926 | 116,539 | 89,197
Equity Instruments Other than Options, Vested in Period |  | (76,664) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (4,599) |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance |  | 223,146 | 189,483 |
Equity Instruments Other than Options, Vested, Aggregrate Intrinsic Value |  | $ 2.7 |  |
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value |  | $ 7.8 |  |
Restricted Stock [Member] | Og and E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance |  | 52,759 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 35,034 | 32,804 | 22,911
Equity Instruments Other than Options, Vested in Period |  | (20,265) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (2,725) |  |
Equity Other Than Options, Employee Migration | [4] | (559) |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance |  | 64,244 | 52,759 |
Equity Instruments Other than Options, Vested, Aggregrate Intrinsic Value |  | $ 0.7 |  |
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value |  | $ 2.2 |  |
[1] | For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
[2] | These amounts represent performance units that vested at December 31, 2022, which were settled in February 2023.
[3] | These amounts represent performance units that vested at December 31, 2023. Actual expected amounts to be paid out in 2024 will differ based on the percentage at which the performance metric was met and are dependent upon Compensation Committee approval.
[4] | Due to certain employees transferring between OG&E and OGE Energy.

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