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Retirement Plans and Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block] |
| OGE Energy |  | OG&E
| Three Months Ended | Six Months Ended |  | Three Months Ended | Six Months Ended
| June 30, | June 30, |  | June 30, | June 30,
(In millions) | 2021 | 2020 | 2021 | 2020 |  | 2021 | 2020 | 2021 | 2020
Capitalized portion of net periodic pension benefit cost | $ | 0.8 |  | $ | 0.8 |  | $ | 1.6 |  | $ | 1.8 |  |  | $ | 0.7 |  | $ | 0.6 |  | $ | 1.4 |  | $ | 1.5 |
Capitalized portion of net periodic postretirement benefit cost | $ | — |  | $ | 0.1 |  | $ | 0.1 |  | $ | 0.1 |  |  | $ | 0.1 |  | $ | 0.1 |  | $ | 0.1 |  | $ | 0.1 |

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- Definition Schedule of Capitalized Pension and Postretirement Cost [Table Text Block] + References No definition available. + Details
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- References No definition available. + Details
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