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Income Taxes - Summary of Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Income Taxes [Line Items] |  |
State tax credits | $ (228.8) | $ (221.2)
Og and E [Member] |  |
Income Taxes [Line Items] |  |
State tax credits | (213.5) | $ (208.5)
Oklahoma investment tax credits [Member] |  |
Income Taxes [Line Items] |  |
Tax Credit Carryforward, Amount | 259.1 |
State tax credits | 204.7 |
Oklahoma investment tax credits [Member] | Og and E [Member] |  |
Income Taxes [Line Items] |  |
Tax Credit Carryforward, Amount | 239.8 |
State tax credits | 189.4 |
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 | 16.0 |
State tax credits | 11.3 |
Oklahoma zero emission tax credits [Member] | Og and E [Member] |  |
Income Taxes [Line Items] |  |
Tax Credit Carryforward, Amount | 16.0 |
State tax credits | $ 11.3 |

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- Definition Non-Current Deferred Tax Assets, State Tax Credits + References No definition available. + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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