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Retirement Plans and Postretirement Benefit Plans - Schedule of Capitalized Pension and Postretirement Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized portion of net periodic pension benefit cost	$ 0.0	$ 0.6
Pension Plan [Member] | OG&E [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized portion of net periodic pension benefit cost	0.6	0.5
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized portion of net periodic pension benefit cost	0.0	0.0
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

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- Definition

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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- Details

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- Details

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