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Income Taxes - Summary of Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Income Taxes [Line Items]
State tax credits	$ (223.8)	$ (228.8)
Og and E [Member]
Income Taxes [Line Items]
State tax credits	(208.5)	$ (213.5)
Oklahoma investment tax credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	264.3
State tax credits	208.8
Oklahoma investment tax credits [Member] \| Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	245.0
State tax credits	193.5
Oklahoma capital investment board credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	12.8
State tax credits	12.8
Oklahoma capital investment board credits [Member] \| Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	12.8
State tax credits	12.8
Oklahoma zero emission tax credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	4.2
State tax credits	2.2
Oklahoma zero emission tax credits [Member] \| Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	4.2
State tax credits	$ 2.2