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Retirement Plans and Postretirement Benefit Plans - Schedule of Capitalized Pension and Postretirement Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Capitalized portion of net periodic pension benefit cost | $ 0.6 | $ 0.7 | $ 1.7 | $ 2.2
Pension Plan [Member] | OG&E [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Capitalized portion of net periodic pension benefit cost | 0.4 | 0.7 | 1.4 | 1.9
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Capitalized portion of net periodic pension benefit cost | 0.0 | 0.1 | 0.1 | 0.2
Other Postretirement Benefits Plan [Member] | OG&E [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Capitalized portion of net periodic pension benefit cost | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.1

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