Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Income Taxes [Line Items]
Accelerated depreciation and other property related differences	$ 1,809.5	$ 1,753.8
Regulatory assets	65.6	67.6
Pension Plan	22.0	21.8
Corporate owned life insurance	2.8	2.6
Bond redemption-unamortized costs	1.2	1.4
Income taxes recoverable from customers, net	(188.6)	(202.7)
State tax credits	(223.8)	(228.8)
Regulatory liabilities	(57.3)	(54.4)
Asset retirement obligations	(20.9)	(19.7)
Postretirement medical and life insurance benefits	(19.1)	(20.8)
Accrued liabilities	(15.7)	(13.2)
Deferred federal investment tax credits	(2.5)	(2.7)
Accrued vacation	(1.9)	(1.4)
Uncollectible accounts	(0.5)	(0.5)
Other	0.3	(2.2)
Deferred Income Tax Liabilities, Net, Total	1,371.1	1,300.8
Og and E [Member]
Income Taxes [Line Items]
Accelerated depreciation and other property related differences	1,809.5	1,753.8
Regulatory assets	65.6	67.6
Pension Plan	38.6	37.9
Corporate owned life insurance	0.0	0.0
Bond redemption-unamortized costs	1.2	1.4
Income taxes recoverable from customers, net	(188.6)	(202.7)
State tax credits	(208.5)	(213.5)
Regulatory liabilities	(57.3)	(54.4)
Asset retirement obligations	(20.9)	(19.7)
Postretirement medical and life insurance benefits	(12.6)	(14.0)
Accrued liabilities	(9.8)	(5.5)
Deferred federal investment tax credits	(2.5)	(2.7)
Accrued vacation	(1.9)	(1.4)
Uncollectible accounts	(0.5)	(0.4)
Other	(1.6)	(5.6)
Deferred Income Tax Liabilities, Net, Total	$ 1,410.7	$ 1,340.8

Deferred tax liabilities corporate owned life insurance.

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Deferred Tax Liabilities, Income Taxes Refundable to Customers, Net

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Deferred Tax Liabilities, Unamortized Bond Redemption Costs

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Income taxes.

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Non-Current Deferred Tax Assets, Deferred Federal Investment Tax Credits

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Non-Current Deferred Tax Assets, Regulatory Liabilities

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Non-Current Deferred Tax Assets, State Tax Credits

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(b)(2))
-Publisher FASB
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-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482525/740-10-45-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Publisher FASB
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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-URI https://asc.fasb.org/1943274/2147482685/740-10-50-6

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on accounts receivable.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets.

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