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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Capitalized portion of net periodic pension benefit cost | $ 0.6 | $ 0.5 | $ 1.8 | $ 1.6
Pension Plan [Member] | OG&E [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Capitalized portion of net periodic pension benefit cost | 0.6 | 0.5 | 1.8 | 1.6
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Capitalized portion of net periodic pension benefit cost | 0.0 | 0.0 | 0.0 | 0.1
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 | $ 0.0 | $ 0.1

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