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Retirement Plans and Postretirement Benefit Plans - Schedule of Capitalized Pension and Postretirement Cost (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Capitalized Portion of Net Periodic Benefit Cost | $ 2.2 | $ 3.0 | $ 3.4
Pension Plan [Member] | Og and E [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Capitalized Portion of Net Periodic Benefit Cost | 1.9 | 2.5 | 2.9
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Capitalized Portion of Net Periodic Benefit Cost | 0.1 | 0.2 | 0.2
Other Postretirement Benefits Plan [Member] | Og and E [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Capitalized Portion of Net Periodic Benefit Cost | $ 0.1 | $ 0.1 | $ 0.1

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