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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

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